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  • 11
    Electronic Resource
    Electronic Resource
    Lattice instability in the normal state of La2−x Sr x CuO4 (1994)
    Springer
    Journal of superconductivity 7 (1994), S. 419-421 
    Details
    ISSN: 1572-9605
    Keywords: Ultrasonic experiments ; lattice instability ; single-crystalline LSCO ; electron-phonon coupling ; electronic band structure
    Source: Springer Online Journal Archives 1860-2000
    Topics: Electrical Engineering, Measurement and Control Technology , Physics
    Notes: Abstract Novel softening has been found in the transverse elastic constant (C 11–C 12)/2 below 50 K in single-crystalline La1.86Sr0.14CuO4 (LSCO) by high-precision ultrasonic measurements in magnetic fieldsH along thec axis. With decreasing temperature, this lattice softening persists down to the superconducting transition temperatureT c(H), which is reduced to 14 K by applying fields up to 14 T. BelowT c(H) the softening turns to rapid hardening. This behavior indicates the presence of lattice instability of the orthorhombic (Bmab) structure in the normal state of LSCO, which disappears in the superconducting state. This is evidence for the intimate interplay between high-T c superconductivity and the lattice instability in LSCO.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00724580
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  • 12
    Electronic Resource
    Electronic Resource
    Probing oxygen in high Tc superconductor LaSrCuO by negative muons (1991)
    Springer
    Hyperfine interactions 65 (1991), S. 1015-1026 
    Details
    ISSN: 1572-9540
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract A novel microscopic method of muon spin rotation for negative muon (μ−) attached to oxygen is applied on highT c materials LaSrCuO. The paramagnetic shift and relaxation rate are measured as a function of Sr concentration and temperature. Analysis shows the large difference in shift and relaxation between two different sites. A large anisotropy was also observed by preliminary measurements along different crystalline axes.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02397757
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  • 13
    Electronic Resource
    Electronic Resource
    Interaction of paramagnetic electron with highT c supercurrent in LaSrCuO studied by (μ−O) probe (1996)
    Springer
    Hyperfine interactions 97-98 (1996), S. 387-394 
    Details
    ISSN: 1572-9540
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The paramagnetic state of the muonic atom formed by the negative muon (μ −) bound to the oxygen in highT c LaSrCuO which was found in our recentμ − spin rotation experiments was applied to probe an interaction between the paramagnetic electron and the highT c supercurrent. The observed enhanced spin relaxation rates of the (μ −O) system in the superconducting state revealed the presence of such an interaction.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02150187
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  • 14
    Electronic Resource
    Electronic Resource
    Interactions of amphiphilic drugs withα-,β-, andγ-cyclodextrins (1993)
    Springer
    Colloid & polymer science 271 (1993), S. 499-506 
    Details
    ISSN: 1435-1536
    Keywords: Amphiphile ; drug ; cyclodextrin ; inclusion complex ; hydrophobic interaction ; drug-sensitive electrode
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Abstract The association of several amphiphilic drugs with α-, β-, and γ-cyclodextrins has been measured by use of drug-sensitive electrodes. Drugs investigated are hydrochlorides of chlorpromazine, dibucaine, tetracaine, and procaine, and valethamate bromide. Each drug forms the drug:cyclodextrin=1∶1 complex with α- and β-cyclodextrin, and both the 1∶1 and 2∶1 complex with γ-cyclodextrin, except valethamate which only forms the 1∶1 complex. The strength of the 1∶1 complex formations is in the order of βCyD〉α-CyD〉γ-CyD. The association constant of the 2∶1 complex in drug-γ-CyD is larger than that of 1∶1 complex. The free energy change of the conplex formation has a positive correlation with that of the micelle formation of drugs. The deviation from this relation is explained in terms of fittability of the bulky hydrophobic group of drugs into the cyclodextrin's cavity. The free energy change for the complex formation between chlopromazine or valethamate and β-CyD is governed by the enthalpy term and not by the entropy term which controls the surfactant-β-CyD interactions.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00657395
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  • 15
    Electronic Resource
    Electronic Resource
    Attachment of kinetochores to spindle microtubules during meiosis I of Lilium microsporocytes (1999)
    Springer
    Chromosome research 7 (1999), S. 121-130 
    Details
    ISSN: 1573-6849
    Keywords: centromere/kinetochore ; first meiotic division ; immunofluorescence ; plant meiocytes ; spindle microtubules
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Kinetochores and microtubules were visualized simultaneously during spindle formation at the first meiotic division in microsporocytes of Lilium longiflorum (2n = 24) under a confocal laser-scanning microscope, after immunofluorescence staining with centromere-recognizing antiserum and tubulin-specific antibody. During early prometaphase I, each kinetochore of bivalent chromosomes appeared to be an amorphous flat structure upon its initial attachment to microtubules. It became compact and spherical with the development of the spindle. From late prometaphase I, when the bipolar spindle was nearly complete, each kinetochore resembled a double disk that was suggestive of a pair of sister kinetochores and the homologous kinetochores were oriented towards opposite poles. Thus, the bipolar spindle at metaphase I included 12 bivalent chromosomes with a total of four kinetochores each. At anaphase I, the sister kinetochores moved to the same spindle pole as a paired unit. In microsporocytes arrested at prometaphase I by colchicine treatment, the sister kinetochores also came to be distinguishable. These results suggest that the change of kinetochore structure during meiosis I may be under chromosomal control but be somewhat associated with its attachment to spindle microtubules.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1009247116452
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  • 16
    Electronic Resource
    Electronic Resource
    Elastic and inelastic neutron scattering studies on the tetragonal to orthorhombic phase transition of La2−x Sr x CuO4±δ (1994)
    Springer
    The European physical journal 94 (1994), S. 29-37 
    Details
    ISSN: 1434-6036
    Keywords: 74.72.Dn ; 61.50.Ks ; 64.60.Ht
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The phase transition from the tetragonal to the orthorhombic structure in La2−x Sr x CuO4+δ has been studied combining elastic and inelastic neutron scattering and specific heat measurements on the same well characterized crystals. This analysis focusses on the comparison between undoped and doped compounds. The proportionality between the orderparameter and the orthorhombic strain, predicted by the Landau theory, can be confirmed in La2−x Sr x CuO4+δ in a wide concentration and temperature range. We observe different values for the critical exponent β for doped superconducting and undoped insulating crystals. The temperature dependent study of the soft modes on a metallic superconducting crystal reveals an extremely large temperature range where this mode is strongly anharmonic. The comparison with previously published data shows that the frequencies of the soft modes at low temperatures decrease with doping, i.e. with increasing charge carrier concentration.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01307651
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  • 17
    Electronic Resource
    Electronic Resource
    Fracture toughness of Si3N4 and its Si3N4 whisker composite without sintering aids (1991)
    Springer
    Journal of materials science 26 (1991), S. 208-210 
    Details
    ISSN: 1573-4803
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Abstract Si3N4 without sintering aids is studied with special interest to the fracture behaviour and its relation to microstructure. Cracks propagated almost transgranularly and no rising R-curve behaviour was found, because crack-wake region gave no contribution on toughening due to very high grain-boundary bonding strength. Microstructure with highly elongated grains was obtained by addition of 20%Si3N4 whisker, but fracture toughness was found to be similar to that of the monolithic Si3IM4 with equiaxed grains. It is recognized that fracture toughness is not determined simply by apparent microstructural parameters such as mean aspect ratio of grains when grain-boundary bonding is sufficiently strong. Detailed examination of microfracture behaviour is, therefore, necessary for the analysis of toughening in this kind of composites.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00576053
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  • 18
    Electronic Resource
    Electronic Resource
    Solution effect on the slow crack growth resistance of dilute sialons at high temperatures (1992)
    Springer
    Journal of materials science 27 (1992), S. 4089-4096 
    Details
    ISSN: 1573-4803
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Abstract High purity Si3N4 powder was sintered with only 0.5–1.0 wt% AlN by hot isostatic pressing (HIP) and its delayed failure behaviour at around 1400°C has been studied with interest to determine the role of Al atoms. Al atoms are found completely dissolved in the Si3N4 matrix as dilute sialon solid solutions by detailed analyses of phase composition. Flaw sensitivity increased considerably with the AlN addition, which was ascribed to the decrease in slow crack growth (SCG) resistance. Static-load lifetime under the same stress was remarkably decreased by the addition, which showed good agreement with that predicted from the experimentally obtained SCG resistance. Internal friction behaviour as well as microstructural investigation found no intergranular mechanisms for the SCG enhancement. Solution effect of Al and O atoms in the β-Si3N4 matrix and resulting virtual defect of covalent bonding was proposed to be their origin.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01105110
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  • 19
    Electronic Resource
    Electronic Resource
    Probing interaction of paramagnetic electron with conduction electrons in high Tc superconductor LaSrCuO by (μ-O) spin relaxation (1997)
    Springer
    Hyperfine interactions 105 (1997), S. 175-179 
    Details
    ISSN: 1572-9540
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The paramagnetic (μ-O) state formed at the oxygen site in high Tc LaSrCuO was used to probe an interaction between the localized moment of the paramagnetic electron and the conduction electrons via zero field μ- spin relaxation. The enhanced relaxation rates consistently observed in the superconducting state of various Sr concentrations are explained as an effect of spin‐pairing in the high Tc supercurrent.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1012639018378
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  • 20
    Electronic Resource
    Electronic Resource
    Muon spin relaxation study on magnetism in high quality single crystal of a high transition temperature superconductor La2−xSrxCuO4−σ (0.11≤x≤0.14) (1991)
    Springer
    Hyperfine interactions 63 (1991), S. 271-277 
    Details
    ISSN: 1572-9540
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The positive muon spin relaxation method is applied to probe magnetic ordering in the superconducting phase of a high quality single crystal of La2−xSrxCuO4−σ (0.11≤x≤0.14). The well characterized crystal ofx=0.11 (T c=34.5 K) with nearly complete flux exclusion exhibits spin freezing at 8K(T f) with significant spin fluctuation up to 20 K. The onset of spin fluctuation andT f decrease against increasingx towardsx=0.15, suggesting an existence of a magnetic phase boundary aroundx whereT c becomes maximum.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02396014
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