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  • Articles  (24)
  • structure  (13)
  • Superconductivity  (12)
  • Springer  (24)
  • American Geophysical Union
  • American Institute of Physics (AIP)
  • American Physical Society
  • Blackwell Publishing Ltd
  • Institute of Physics
  • Oxford University Press
  • 1995-1999  (24)
  • 1945-1949
  • 1998  (24)
  • Physics  (23)
  • Electrical Engineering, Measurement and Control Technology  (13)
  • Natural Sciences in General  (1)
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  • Articles  (24)
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  • Springer  (24)
  • American Geophysical Union
  • American Institute of Physics (AIP)
  • American Physical Society
  • Blackwell Publishing Ltd
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  • 1995-1999  (24)
  • 1945-1949
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  • 1
    Electronic Resource
    Electronic Resource
    Synthetic Methodologies and Structures of Metal-[C60]Fullerene Complexes (1998)
    Springer
    Journal of cluster science 9 (1998), S. 393-415 
    Details
    ISSN: 1572-8862
    Keywords: Fullerene ; transition-metal ; complex ; synthesis ; structure
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Abstract A review of the chemistry of transition metal-[C60]fullerene complexes is presented. The main focus is directed toward the different methodologies for obtaining both metal bound and ligand bound complexes of C60, and the different types of structures which have been so far identified for metal-C60 complexes.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1021934431858
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  • 2
    Electronic Resource
    Electronic Resource
    Crystal structures of the cobalt(III), nickel(II), copper(II), and zinc(II) complexes of 2-thio-6-picoline N-oxide (1998)
    Springer
    Journal of chemical crystallography 28 (1998), S. 853-860 
    Details
    ISSN: 1572-8854
    Keywords: 2-thio-6-picoline N-oxide ; structure ; cobalt(III) ; copper(II) ; nickel(II) ; zinc(II)
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences , Physics
    Notes: Abstract Structures of the following compounds have been solved: tris(2-thio-6-picoline N-oxide)cobalt(III), [Co(6MOS)3], orthorhombic, Pca21, a = 17.871(3), b = 14.061(2), c = 15.964(2) Å, V = 4011(1) Å3, Z = 8, and μ = 1.193 mm−1; bis (2-thio-6-picoline N-oxide)nickel(II), [Ni(6MOS)2], orthorhombic, Pbca, a = 15.602(8), b = 13.606(4), c = 13.348(8) Å, V = 2833(4) Å3, Z = 8, and μ = 1.655 mm−1; bis(2-thio-6-picoline N-oxide)copper(II), [Cu(6MOS)2], orthorhombic, Pbca, a = 13.914(5), b = 12.984(5), c = 15.663(6) Å, V = 2830(2) Å3, Z = 8, and μ = 1.836 mm−1; and bis(2-thio-6-picoline N-oxide)zinc(II), [Zn(6MOS)2], triclinic, P − 1, a = 7.9737(8), b = 11.7786(9), c = 7.9206(8) Å, α = 104.502(7), β = 104.495(8), γ = 93.445(8)°, V = 691.3(1) Å3, Z = 2, and μ = 2.106 mm−1. The steric effect of the methyl group in the six-position of the N-oxide ring is considered in comparing these structures to complexes of 2-thiopyridine N-oxide.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1022886116342
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  • 3
    Electronic Resource
    Electronic Resource
    Synthesis and crystal structure of [Y(NO3)3(OH2)3]·(Me2-16-crown-5)·H2O (1998)
    Springer
    Journal of chemical crystallography 28 (1998), S. 197-201 
    Details
    ISSN: 1572-8854
    Keywords: Yttrium(III) ion ; crown ether ; structure
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences , Physics
    Notes: Abstract The complex [Y(NO3)3(OH2)3]·(Me2-16-crown-5)·H2O has been prepared and its crystal and molecular structure determined using single crystal X-ray diffraction. The colorless crystals belong to the monoclinic space group P21/n with Z = 4. Lattice parameters are a = 10.420(1), b = 17.257(3), c = 14.646(2) Å, β = 96.79(1)°, V = 2615.1(6) Å3. The yttrium(III) ion is nine-coordinate, bonded to three bidentate nitrate groups and three water molecules. The average Y–O(nitrate) and Y–O(water) distances are 2.42(3) and 2.33(1) Å, respectively. The average HO–H···O hydrogen bonded separation is 2.767Å.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1022470227008
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  • 4
    Electronic Resource
    Electronic Resource
    Crystal structure of N-benzylmethylammonium dihydrogen-monophosphate monohydrate, [C6H5CH2NH2CH3]H2PO4·H2O (1998)
    Springer
    Journal of chemical crystallography 28 (1998), S. 313-315 
    Details
    ISSN: 1572-8854
    Keywords: Organic phosphate ; structure ; nonlinear optical material
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences , Physics
    Notes: Abstract The salt N-benzylmethylammonium dihydrogenmonophosphate monohydrate is monoclinic with the following unit cell dimensions: a = 6.356(1)Å, b = 8.385(7)Å, c = 11.472(5)Å, β = 104.32(1)°, space group P21 with Z = 2. The structure consists of infinite parallel two-dimensional [110] planes built of mutually connected ions and water molecules by strong O–H···O and N–H···O hydrogen bonding. There are no contacts other than normal van der Waals interactions between the layers.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1021861621824
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  • 5
    Electronic Resource
    Electronic Resource
    Crystal structure and resonance Raman spectroscopic study of {1,3-bis[3-(5-amino-1,2,4-triazolyl)]triazenido-N′4,N2,N″4}chloro palladium(II)-methanol (1/1) (1998)
    Springer
    Journal of chemical crystallography 28 (1998), S. 343-351 
    Details
    ISSN: 1572-8854
    Keywords: Azole ; triazene ; Pd(II) ; Cu(II) ; structure ; Raman
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences , Physics
    Notes: Abstract The crystal and molecular structure of the complex [Pd(batt)Cl]·CH3OH, in which Hbatt is 1,3-bis[3-(5-amino-1,2,4-triazolyl)]triazene, has been determined by X-ray diffraction methods. The crystals are triclinic, space group $$P_{\bar 1} $$ (a = 10.1883(9) Å, b = 10.5095(8)Å, c = 13.1760(11) Å, α = 94.518(6)°, β = 109.040(7)°, γ = 113.678(7)°; Z = 4). The deprotonated batt− ligand exhibits terdentate chelate coordination with a new nitro-type ligation mode of the triazenido group and N4 coordination of the two outer triazolyl substituents. The asymmetric unit contains two crystallographically independent, almost parallel Pd(batt)Cl molecules with Pd–Pd contacts of 3.4584(7)Å and two independent methanol molecules. The complexes are packed in a layer structure with numerous intermolecular H-bond connections. Raman spectra have been recorded for various excitation wavelengths along the contour of the intense triazenido π-π* absorption band at 465 nm and resonance profiles measured for the most important Raman bands. A comparison is made with the analog [Cu(batt)Cl] complex. Structural and spectral differences between the two molecules are emphasized and related to differences in metal-ligand bonding.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1022456023875
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  • 6
    Electronic Resource
    Electronic Resource
    Synthesis and Molecular Structure of the Mercury-Bridged Heteronuclear Complex [Pt3(dppm)3 {(μ4-Hg)-RuCp(CO)2}2][PF6]2 (1998)
    Springer
    Journal of cluster science 9 (1998), S. 107-121 
    Details
    ISSN: 1572-8862
    Keywords: Platinum ; mercury ; ruthenium ; heteronuclear ; cluster ; structure
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Abstract Addition of a THF solution prepared by stirring [CpRu(CO)2]2 over Na/Hg amalgam to a solution of the triplatinum cluster [Pt3(dppm)3(CO)][PF6]2 (1) in THF gives the heteronuclear cluster [Pt3(dppm)3{(μ4-Hg)–RuCp(CO)2}2] [PF6]2 (2) in 40% yield following chromatography. A single crystal X-ray study of 2 reveals structural parameters for the Pt3Hg2 molecular core that are consistent with those of other structurally characterized complexes of this type. 1H, 13C, and 31P NMR spectra of this complex indicate that the structure observed in the solid state is retained in solution.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1021933831065
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  • 7
    Electronic Resource
    Electronic Resource
    Localization of iron-reducing activity in paddy soil by profile studies (1998)
    Springer
    Foundations of science 3 (1998), S. 341-357 
    Details
    ISSN: 1572-8471
    Keywords: Substance philosophy ; process philosophy ; structure
    Source: Springer Online Journal Archives 1860-2000
    Topics: Natural Sciences in General
    Notes: Abstract The aim of this contribution is to analyze the difficulties and possible inconsistencies one may encounter when attempting to integrate substance philosophy and process philosophy. I argue that it is impossible to avoid these problems, and offer a typology that helps to understand the tensions involved in attempts to integrate these two worldviews.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1009650720124
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  • 8
    Electronic Resource
    Electronic Resource
    DC Electrical Resistivity Study of Granularity in YBa2CU3O7/Ag Composites (1998)
    Springer
    Journal of superconductivity 11 (1998), S. 641-648 
    Details
    ISSN: 1572-9605
    Keywords: Superconductivity ; Ag composites ; percolation ; granularity ; weak-link resistivity
    Source: Springer Online Journal Archives 1860-2000
    Topics: Electrical Engineering, Measurement and Control Technology , Physics
    Notes: Abstract Temperature-dependent electrical resistivity in a set of YBa2Cu3O7−x /Ag composites, all prepared under an identical sintering schedule, is analyzed to extract granularity information. The weak-link resistivity ρ wl across the grain boundaries and the percolation factor α arising due to current frustration caused by misalignment of anisotropic grains and sample defects such as voids and cracks are estimated from the residual resistivity ρ0 and the temperature coefficient of resistivity dρ/dT. Variation of these parameters with Ag vol.% quantifying the extent of granularity indicates that granularity in the composites decreases and their electrical characteristics tend to be identical to that of Ag-free YBa2Cu3O7−x single crystals and epitaxial thin films as Ag vol.% approaches a value where onset of current percolation occurs through Ag channels. The increased α and decreased ρ wl observed at higher Ag vol.% explains the larger grains in the composites with narrow size distribution.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1022609432697
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  • 9
    Electronic Resource
    Electronic Resource
    Effect of Ca Substitution on the Superconductivity of La2.5Y0.5CaBa3(Cu0.88Fe0.12)7O z (1998)
    Springer
    Journal of superconductivity 11 (1998), S. 673-676 
    Details
    ISSN: 1572-9605
    Keywords: Superconductivity ; La2.5Y0.5CaBa3(Cu0.88Fe0.12)7O z ; compensated oxide ; magnetic pair breaking
    Source: Springer Online Journal Archives 1860-2000
    Topics: Electrical Engineering, Measurement and Control Technology , Physics
    Notes: Abstract The structural and superconducting properties of single-phase La2.5−y Y0.5Ca1+y Ba3 (Cu0.88Fe0.12)7O z (LYCaBCuFe) (y= 0.0−1.0) compounds with triple perovskite structure are investigated using X-ray diffraction, resistivity, a.c. susceptibility, and oxygen content measurements. Increasing Ca substitution for La resulted in a decrease in unit cell axes and volume. T c R=0 shows a marginal increase from 31 K to 37 K for y = 0.0−0.21 and thereafter it decreases with increasing y leading to zero T c R=0 at y ≥ 0.84. This shows that the suppression of T c from 80 K to 31 K by Fe doping at x = 0.12 La2.5Y0.5CaBa3(Cu1−x Fe x )7O z cannot be compensated by appropriate hole doping with Ca in LaYCaBCuFe.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1022620518584
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  • 10
    Electronic Resource
    Electronic Resource
    Superconductivity and Antiferromagnetic Order in ErNi2B2C Thin Films (1998)
    Springer
    Journal of superconductivity 11 (1998), S. 707-712 
    Details
    ISSN: 1572-9605
    Keywords: Superconductivity ; antiferromagnetic order ; ErNi2Bi2C
    Source: Springer Online Journal Archives 1860-2000
    Topics: Electrical Engineering, Measurement and Control Technology , Physics
    Notes: Abstract Upper critical field and penetration depth of superconducting ErNi2B2C borocarbide thin films have been investigated and compared with the same properties of SmRh4B4 films. The coexistence of superconductivity and antiferromagnetic order is described through Machida's theory. A fairly satisfactory description of the experimental results is obtained.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1022632921310
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  • 11
    Electronic Resource
    Electronic Resource
    Duality in Two Capacitively Coupled Layered Arrays of Ultrasmall Josephson Junctions (1998)
    Springer
    Journal of statistical physics 93 (1998), S. 943-964 
    Details
    ISSN: 1572-9613
    Keywords: Superconductivity ; macroscopic quantum phenomena ; mesoscopic systems
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract We consider the problem of two capacitively coupled Josephson junction arrays made of ultrasmall junctions. Each one of the arrays can be in the semiclassical or quantum regimes, depending on its physical parameter values. The former case is dominated by a Cooper-pair superfluid, while the quantum case is dominated by dynamic vortices leading to an insulating behavior. We first consider the limit when both arrays are in the semiclassical limit, and next the case when one array is quantum and the other semiclassical. We present WKB and mean-field theory results for the critical temperature of each array when both are in the semiclassical limit. When one array is in the semiclassical regime and the other one is in the quantum-fluctuations-dominated regime, we derive a duality transformation between the charge and vortex-dominated arrays that involves a gauge vector field which is proportional to the site coupling capacitance between the arrays. The system considered here has been fabricated and we make some predictions as to possible experimentally measurable quantities that could be compared with theory.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/B:JOSS.0000033171.04828.d6
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  • 12
    Electronic Resource
    Electronic Resource
    Correlations between 29Si, 17O and 1H NMR properties and local structures in silicates: an ab initio calculation (1998)
    Springer
    Physics and chemistry of minerals 26 (1998), S. 14-30 
    Details
    ISSN: 1432-2021
    Keywords: Key words ab initio ; NMR ; silicates ; structure
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Geosciences , Physics
    Notes: Abstract  In order to gain insight into the correlations between 29Si, 17O and 1H NMR properties (chemical shift and quadrupolar coupling parameters) and local structures in silicates, ab initio self-consistent field Hartree-Fock molecular orbital calculations have been carried out on silicate clusters of various polymerizations and intertetrahedral (Si-O-Si) angles. These include Si(OH)4 monomers (isolated as well as interacting), Si2O(OH)6 dimers (C2 symmetry) with the Si-O-Si angle fixed at 5° intervals from 120° to 180°, Si3O2(OH)8 linear trimers (C2 symmetry) with varying Si-O-Si angles, Si3O3(OH)6 three-membered rings (D3 and C1 symmetries), Si4O4(OH)8 four-membered ring (C4 symmetry) and Si8O12(OH)8 octamer (D4 symmetry). The calculated 29Si, 17O and 1H isotropic chemical shifts (δi Si, δi O and δi H) for these clusters are all close to experimental NMR data for similar local structures in crystalline silicates. The calculated 17O quadrupolar coupling constants (QCC) of the bridging oxygens (Si-O-Si) are also in good agreement with experimental data. The calculated 17O QCC of silanols (Si-O-H) are much larger than those of the bridging oxygens, but unfortunately there are no experimental data for similar groups in well-characterized crystalline phases for comparison. There is a good correlation between δi Si and the mean Si-O-Si angle for both Q 1 and Q 2, where Q n denotes Si with n other tetrahedral Si next-nearest neighbors. Both the δ i O and the 17O electric field gradient asymmetry parameter, η of the bridging oxygens have been found to depend strongly on the O site symmetry, in addition to the Si-O-Si angle. On the other hand, the 17O QCC seems to be influenced little by structural parameters other than the Si-O-Si angle, and is thus expected to be the most reliable 17O NMR parameter that can be used to decipher Si-O-Si angle distribution information. Both the 17O QCC and the 2H QCC of silanols decrease with decreasing length of hydrogen bond to a second O atom (Si-O-H···O), and the δ i H increase with the same parameter.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s002690050157
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  • 13
    Electronic Resource
    Electronic Resource
    Phase structure change and ER effect in liquid crystalline polymer/dimethylsiloxane blends (1998)
    Springer
    Rheologica acta 37 (1998), S. 54-60 
    Details
    ISSN: 1435-1528
    Keywords: Key words Electrorheology ; LCP/DMS blend ; slipping ; structure ; phase structure change ; direct observation
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: Abstract The mechanism of the electrorheological (ER) effect in two types of liquid crystalline polymer (LCP)/dimethylsiloxane (DMS) blends was investigated by rheological measurements and by structure observation under electric field and shear flow. The results show that the phase structures of these immiscible blends can be categorized into slipping (low viscosity) and non-slipping (high viscosity) states. In the non-slipping state, higher viscosity LCP domains connect the electrodes. In the slipping state, on the other hand, LCP domains do not connect the electrodes and the shear is mainly confined in the lower viscosity DMS domains. The ER effect (electrically induced viscosity increase) originates from the electrically induced slipping to non-slipping transition. In one of the blends, the ER effect occurs only at high shear rate, since this blend is in non-slipping state even under no field if the shear rate is low.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s003970050090
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  • 14
    Electronic Resource
    Electronic Resource
    Rare-Earths as Probes of High-Temperature Superconductivity (1998)
    Springer
    Journal of superconductivity 11 (1998), S. 615-639 
    Details
    ISSN: 1572-9605
    Keywords: Superconductivity ; rare-earths
    Source: Springer Online Journal Archives 1860-2000
    Topics: Electrical Engineering, Measurement and Control Technology , Physics
    Notes: Abstract Using only two principles: (i) high-temperature superconductivity requires hypercharged oxygen, and (ii) the superconducting condensates are located in those parts of the crystal structures where they are unaffected by magnetic pair breaking, we are able to explain why certain rare-earth ions R are compatible with superconductivity and others are not, in the compounds RBa2Cu3O7, RBa2Cu4O8, RBa2Cu2NbO8, R2 − z Ce z CuO4, and R2 − z Ce z Sr2Cu2NbO10. Various defects are proposed as having central roles in the superconductivity or the suppression of superconductivity in these compounds. Many experiments for testing this physical picture are suggested.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1022643531034
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  • 15
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    The Effect of Fluorine on the Phase Formation and Properties of Tl-Based Superconductors (1998)
    Springer
    Journal of superconductivity 11 (1998), S. 95-96 
    Details
    ISSN: 1572-9605
    Keywords: Tl-based superconductors ; fluorine ; structure
    Source: Springer Online Journal Archives 1860-2000
    Topics: Electrical Engineering, Measurement and Control Technology , Physics
    Notes: Abstract Fluorine was found to affect the phase formation and superconducting properties of Tl-based superconductors. By varying x in (Tl0.5Pb0.5)Sr1.6Ba0.4Ca2Cu3OyFx synthesized superconductors, an increase was found in the transition temperature and critical current density. These improvements in the superconducting properties are discussed in terms of partial substitution of fluorine into the oxygen sites which in turn affects the hole doping in this material. Structure, microstructure and elemental analysis by XRD, SEM and EDX techniques are reported; the latter of which shows the fluorine distribution.
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    URL: http://dx.doi.org/10.1023/A:1022606618216
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  • 16
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    Navy Programs in Superconducting Technology (1998)
    Springer
    Journal of superconductivity 11 (1998), S. 1-4 
    Details
    ISSN: 1572-9605
    Keywords: Superconductivity ; magnets ; cryogenics
    Source: Springer Online Journal Archives 1860-2000
    Topics: Electrical Engineering, Measurement and Control Technology , Physics
    Notes: Abstract A review of U.S. Navy efforts in superconducting technology is given. Programs include development of superconducting magnets for motors in ship propulsion systems and to generate magnetic moments in mine sweeping systems. A program to develop superconducting quantum interference devices (SQUIDs) for detection of mines and buried ordnance has successfully been demonstrated. In electronic applications, superconducting filters, resonators, and antennae are being developed for radar, communication, and space systems. Concurrent with these superconductivity programs are efforts to improve the efficiency, reliability, and affordability of refrigeration systems.
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    URL: http://dx.doi.org/10.1023/A:1022656620516
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  • 17
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    Coverage and Structure of Films of Spherical Particles Deposited after Diffusing in a Gravitational Field (1998)
    Springer
    Journal of statistical physics 92 (1998), S. 891-908 
    Details
    ISSN: 1572-9613
    Keywords: Random sequential adsorption ; hard-sphere particles ; gravity ; diffusion ; coverage ; structure
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract We investigate the coverage and structure of a layer of particles deposited on a line after diffusion in a gravitational field. The dynamics of the depositing particles is controlled by the gravity number N G(=πd 4 Δρg/6k B T), where d is the diameter of the particles, Δρ is the density difference between the particles and the solution, g is the acceleration due to gravity, k B is Boltzmann's constant, and T is the temperature. The position-dependent flux of particles in a gap formed by two preadsorbed particles is estimated by superposition of solutions of a steady-state convective diffusion equation for the flux in the presence of a single preadsorbed particle. The saturation coverages are found with a recursion relation and are in good agreement with those obtained from Brownian dynamics simulation. The jamming coverage increases rapidly with increasing particle size, particularly for large values of Δρ. An algorithm is presented to generate adsorbed configurations from which the structure of the deposit is determined.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1023040509781
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  • 18
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    Superconductivity and Critical Coupling in Non-Fermi Liquids (1998)
    Springer
    Journal of superconductivity 11 (1998), S. 339-345 
    Details
    ISSN: 1572-9605
    Keywords: Superconductivity ; non-Fermi liquid
    Source: Springer Online Journal Archives 1860-2000
    Topics: Electrical Engineering, Measurement and Control Technology , Physics
    Notes: Abstract The critical temperature of a superconductor with a non-Fermi liquid ground state has been calculated. The density of states has two different forms and is energy dependent. The critical values of the coupling factor λ were calculated. The constant density of states results are obtained as particular cases. These results are an extension of the work done by Grosu et al. [Phys. Rev. B 56, 8298 (1997)].
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1022694629696
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  • 19
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    Structure and Superconductivity of the Y4Ba8Cu12O27 Nanosuperconductor (1998)
    Springer
    Journal of superconductivity 11 (1998), S. 743-748 
    Details
    ISSN: 1572-9605
    Keywords: Nanocrystals ; nanosuperconductor ; structure ; superconductivity
    Source: Springer Online Journal Archives 1860-2000
    Topics: Electrical Engineering, Measurement and Control Technology , Physics
    Notes: Abstract A nanosuperconductor was prepared and characterized in the present work. The nanosuperconductor consisted of nanocrystals with superconducting transition temperature, T c, of 88 K. Dimension of the nanocrystals is dozens nm in diameter and hundreds nm in length. The compound of the nanocrystals has a formula of Y4Ba8Cu12O27. The structure of the nanocrystals was found to be an orthorhombic perovskite, and the lattice constants were determined as a = 7.634 Å, b = 7.758 Å, and c = 11.654 Å, respectively.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1022697208106
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  • 20
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    The Effect of Nitrates on Thallium Based Oxycarbonate Superconductors (1998)
    Springer
    Journal of superconductivity 11 (1998), S. 123-124 
    Details
    ISSN: 1572-9605
    Keywords: Superconductivity ; Nitrates ; Oxycarbonates
    Source: Springer Online Journal Archives 1860-2000
    Topics: Electrical Engineering, Measurement and Control Technology , Physics
    Notes: Abstract We have synthesised a series of compounds in both the (PbTl)Sr4Cu2O7(CO3)1−y(NO3)y (0.1≤y≤0.5) and TlSr2Ba2Cu2O7(CO3)1−y(NO3)y (0.1≤y≤0.2) systems. We report the synthesis conditions of these materials, an X-ray diffraction analysis of their structure and the changes induced in superconducting behaviour produced by the introduction of nitrate groups into the starting composition.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1022627222759
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  • 21
    Electronic Resource
    Electronic Resource
    Full Wafer In Situ Deposition of Thallium Lead Superconductors (1998)
    Springer
    Journal of superconductivity 11 (1998), S. 129-132 
    Details
    ISSN: 1572-9605
    Keywords: Superconductivity ; TIPbSrCaCuO ; thin films
    Source: Springer Online Journal Archives 1860-2000
    Topics: Electrical Engineering, Measurement and Control Technology , Physics
    Notes: Abstract Thin films of (Tl,Pb)Sr2Ca0.8Y0.2Cu2O7, and (Tl,Pb)Sr2CuO5 can be grown in a single step process which involves sputter deposition from a mixed oxide target and simultaneous thermal evaporation of Tl2O. The use of a radiant heater has allowed extension of this in situ deposition process to full LaAlO3 and NdGaO3 wafers. Variations in the composition of the deposited film is 〈 4% across a 50 mm wafer while the thickness uniformity is ≍ 8%. The highest transition temperature for a (Tl,Pb)Sr2Ca0.8Y0.2 Cu2O7 film thus far is 83 K. The RMS surface roughness of (Tl,Pb)Sr2CuO5 films is uniform across the wafer and approximately 1% of the film thickness for films 20 to 100 nm thick.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1022683307738
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  • 22
    Electronic Resource
    Electronic Resource
    Synthesis and Structure of Hg1−xCrxSr2CuO4+δ Mercurocuprates (1998)
    Springer
    Journal of superconductivity 11 (1998), S. 141-142 
    Details
    ISSN: 1572-9605
    Keywords: Superconductivity ; mercury ; chromium ; synthesis ; structure
    Source: Springer Online Journal Archives 1860-2000
    Topics: Electrical Engineering, Measurement and Control Technology , Physics
    Notes: Abstract We report preliminary results concerning the synthesis and structural characterisation of the chromium stabilised 1201 phases: Hg1−xCrxSr2CuO4+δ. A systematic study of the formation of phases in this system has been undertaken, together with a combined powder neutron and synchrotron x-ray diffraction study, to address the issue of chromium clustering and ordering in this system.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1022691509555
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  • 23
    Electronic Resource
    Electronic Resource
    Superconductivity in Lithium- and Sodium-Doped Mercury-Based Cuprates (1998)
    Springer
    Journal of superconductivity 11 (1998), S. 169-171 
    Details
    ISSN: 1572-9605
    Keywords: Superconductivity ; Alkali-doping ; Hg-based Cuprates
    Source: Springer Online Journal Archives 1860-2000
    Topics: Electrical Engineering, Measurement and Control Technology , Physics
    Notes: Abstract The effect of Na- and Li-doping in Hg-based cuprates has been studied. It has been found that superconductivity can be achieved in samples containing small amount of Na or Li. While little change is found in the crystalline structure, the formed superconducting phase have the onset Tc typically above 140 K and zero-resistance Tc up to 136K. More interestingly, the processing temperature for the doped Hg-1223 can be reduced significantly to near 700 °C which is promising for thin films growth on many technologically compatible substrates.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1022608113189
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  • 24
    Electronic Resource
    Electronic Resource
    Mixed-State Hall Effect in HgBa2CaCu2O6+δ Thin Films with Columnar Defects (1998)
    Springer
    Journal of superconductivity 11 (1998), S. 163-167 
    Details
    ISSN: 1572-9605
    Keywords: Superconductivity ; thin film ; columnar defect ; pinning
    Source: Springer Online Journal Archives 1860-2000
    Topics: Electrical Engineering, Measurement and Control Technology , Physics
    Notes: Abstract The mixed state Hall effect has been studied in high quality HgBa2CaCu2O6+δ thin films while the pinning strength is modified by the irraddition of columnar defects. It has been shown that the pinning strength can be significantly improved by columnar defects. The sign reversal in Hall resistivity is found to be nearly independent of pinning while the scaling behavior between Hall resistivity (ρxy) and longitudinal resistivity (ρxx) is influenced by pinning. The exponent β in the scaling law β xy ∼ β xy β decrease from 1.8 ± 0.1 to 1.5 ± 0.1 as pinning is enhanced. This results suggest that the sign reversal and the scaling are unrelated, and pinning is not the mechanism of the sign reversal.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1022656029119
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