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  • 1
    Electronic Resource
    Electronic Resource
    Critical state models for flux-pinning-induced magnetostriction in type-II superconductors (1994)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 76 (1994), S. 4776-4786 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Models and calculated results are presented for the flux-pinning-induced magnetostriction in type-II superconductors. Three models are considered for the critical state; the original Bean model, the Kim model, and the exponential model in which the critical current density is assumed to depend exponentially on the flux density. The analytic expressions of the length change under the magnetic field are derived for specimens having infinite slab geometry and under the assumption that the reversible part of the total magnetization is negligibly small. The results are used for computer simulations and the hysteresis loops are calculated over a wide range of the relevant parameters. Since the pinning-induced magnetostriction reveals the pinning force directly, the hysteresis loops for each model have different features which are discussed in detail. It is also shown that the pinning force of the sample can be directly inferred from the width of the magnetostriction hysteresis loop. Finally, the experimental results on high-temperature superconductors are discussed in comparison with the calculated results.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.357249
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  • 2
    Electronic Resource
    Electronic Resource
    Wide temperature scaling law of the secondary peak observed in magnetization curves of single crystals (La,Sr)2CuO4 (1993)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 62 (1993), S. 1830-1832 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Magnetization curves of single crystals (La1−xSrx)2CuO4 with various Sr contents were measured. A distinct increase of magnetization with increasing applied field was observed in Sr overdoped compositions, when the magnetic field was applied perpendicular to the CuO2 plane. The field, Bpk , where magnetization showed a maximum value, was strongly dependent on temperature. Its dependence was expressed by a universal relation (square root of)Bpk = c(x)[1−T/Tc(x)] over a wide temperature range; between 4.2 K and Tc. Possible mechanisms which give rise to the observed distinct secondary peak effect are discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.109563
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    Electrical conductivity of a pure C60 single crystal (1992)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 61 (1992), S. 2162-2163 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The temperature dependence of the electrical conductivity of a C60 single crystal is presented in this letter. The single-crystal samples free from solvent contamination were grown up to a size of millimeters order by sublimation of C60 powder with oscillation of the crystal temperature. The electrical conductivity of the single crystal was measured at temperatures between 250 and 295 K. The sharp decrease of the electrical conductivity with temperature around 256 K was observed in association with the phase transition of C60.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.108281
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  • 4
    Electronic Resource
    Electronic Resource
    Magnetostriction of HTSC single crystals (1994)
    Springer
    Journal of superconductivity 7 (1994), S. 283-285 
    Details
    ISSN: 1572-9605
    Keywords: Magnetostriction ; pinning effect ; flux creep ; HTSC single crystals
    Source: Springer Online Journal Archives 1860-2000
    Topics: Electrical Engineering, Measurement and Control Technology , Physics
    Notes: Abstract We have measured the sample length change of HTSC single crystals in the superconducting state in a magnetic field. The magnetic field was applied parallel to the crystallinec-axis direction and was swept at a constant rate of 10 mT/s up to 6 T. The sample length change was measured along theab-plane direction, i.e., perpendicular to the field. We have found for the Bi2Sr2CaCu2O8 single crystals that the relative sample length change (ΔL/L) is extraordinarily large for a superconductor, on the order of 10−4. For the case of (La1−x Sr x )2CuO4, the amount of magnetostriction was not as large as for the Bi system, but the magnetostriction curves had many similarities. For both compounds, a relaxation phenomenon was observed when the field sweep was suspended at a certain field value. These observations are discussed in relation to flux line pinning.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00724553
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  • 5
    Electronic Resource
    Electronic Resource
    Single-crystal growth and anisotropic electrical properties of (La1− xCa x )2CaCu2O6 (1994)
    Springer
    Journal of superconductivity 7 (1994), S. 313-318 
    Details
    ISSN: 1572-9605
    Keywords: (La, Ca)2CaCu2O6, single crystal ; TSFZ technique ; oxygen HIP ; electrical anisotropy
    Source: Springer Online Journal Archives 1860-2000
    Topics: Electrical Engineering, Measurement and Control Technology , Physics
    Notes: Abstract Large single crystals of (La1−x Ca x )2CaCu2O6 were synthesized by the travelling solvent floating zone (TSFZ) technique. The dimension of the grown boules was typically 4 mmφ×30 mm long with thec-axis perpendicular to the growth direction. After oxygen loading at 1080°C in 400 atm of O2, they became superconductive with a sharp transition at around 50 K. The resistivity was metallic both along thec-axis and within theab-plane, with an anisotropy ratio ofγ 2≡(ρ c/ρ ab ) ∼ 50 which is almost independent of temperature. Details of the crystal growth, heat treatment procedures, and the results of electrical and magnetic property measurements are presented.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00724560
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  • 6
    Electronic Resource
    Electronic Resource
    Cryogenic STM/STS observation on oxide superconductors (1994)
    Springer
    Journal of superconductivity 7 (1994), S. 349-353 
    Details
    ISSN: 1572-9605
    Keywords: Scanning tunneling microscopy ; YBa2Cu3Oy ; laser-ablated thin films ; tunneling spectroscopy ; superconducting energy gap
    Source: Springer Online Journal Archives 1860-2000
    Topics: Electrical Engineering, Measurement and Control Technology , Physics
    Notes: Abstract The topographic and electronic properties of the surfaces of (001) and (110) oriented YBa2Cu3Oy, epitaxial films have been probed by atomic resolution STM/STS at 4.2 K. The STM image on the (001) surface clearly revealed the atomic corrugation of the tetragonal lattice with an average spacing of 0.4 nm. while on the (110) surface the orthorhombic atomic lattice, corresponding to the Cu atoms of both CuO2 and CuO chain planes, was observed. The STS result on the (001) surface indicated the semiconducting nature of the terminating layer. As the tunneling tip came closer to the surface, however, the shape of the tunneling spectrum became more metallic and showed a superconducting energy gap, which seems to arise from the underlying superconducting layer. On the other hand, the tunneling spectra on the (110) surface indicated superconducting gap structures, independent of the tip-sample distance.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00724567
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  • 7
    Electronic Resource
    Electronic Resource
    Influence of doping on the electronic structure of (La, Sr)2CuO4 (1994)
    Springer
    Journal of superconductivity 7 (1994), S. 169-173 
    Details
    ISSN: 1572-9605
    Keywords: La2−x Sr x CuO4 ; positron annihilation ; ACAR ; Fermi surface ; Sr doping ; electronic structure
    Source: Springer Online Journal Archives 1860-2000
    Topics: Electrical Engineering, Measurement and Control Technology , Physics
    Notes: Abstract High-statistics (〉4 × 108 counts), room-temperature measurements of the electron-positron momentum density of La2−x Sr x CuO4 have been performed for samples with Sr concentrations of x=0.0, 0.1, 0.13, and 0.2. These spectra have been analyzed in conjunction with theoretical calculations of the electron-positron momentum density. The metallic samples show features consistent with the presence of a Fermi surface, but its evolution with increasing Sr concentration does not follow the predictions of band theory. These results may indicate the effects of electron-electron correlation on the electron momentum distribution in the Cu-O plane.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00730389
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