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  • Articles  (12)
  • Superconductivity  (12)
  • Springer  (12)
  • American Geophysical Union
  • American Institute of Physics (AIP)
  • American Physical Society
  • Blackwell Publishing Ltd
  • Institute of Physics
  • Oxford University Press
  • 1995-1999  (12)
  • 1945-1949
  • 1998  (12)
  • Physics  (12)
  • Electrical Engineering, Measurement and Control Technology  (11)
  • Natural Sciences in General
Collection
  • Articles  (12)
Source
Keywords
Publisher
  • Springer  (12)
  • American Geophysical Union
  • American Institute of Physics (AIP)
  • American Physical Society
  • Blackwell Publishing Ltd
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Years
  • 1995-1999  (12)
  • 1945-1949
Year
Topic
  • Physics  (12)
  • Electrical Engineering, Measurement and Control Technology  (11)
  • Natural Sciences in General
  • 1
    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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  • 2
    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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  • 3
    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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  • 4
    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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  • 5
    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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  • 6
    Electronic Resource
    Electronic Resource
    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.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1022656620516
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  • 7
    Electronic Resource
    Electronic Resource
    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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  • 8
    Electronic Resource
    Electronic Resource
    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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  • 9
    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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  • 10
    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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  • 11
    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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  • 12
    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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