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  • SOLID-STATE PHYSICS  (7)
  • ELECTRONICS AND ELECTRICAL ENGINEERING
  • composite
  • 1985-1989  (7)
  • 1
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    Dimensionality of high temperature superconductivity in oxides (1989)
    In:  Other Sources
    Details
    Publication Date: 2019-07-12
    Description: Many models have been proposed to account for the high temperature superconductivity observed in oxide systems. Almost all of these models proposed are based on the uncoupled low dimensional carrier Cu-O layers of the oxides. Results of several experiments are presented and discussed. They suggest that the high temperature superconductivity observed cannot be strictly two- or one-dimensional, and that the environment between the Cu-O layers and the interlayer coupling play an important role in the occurrence of such high temperature superconductivity. A comment on the very short coherence length reported is also made.
    Keywords: SOLID-STATE PHYSICS
    Type: Physica Scripta (ISSN 0281-1847); T27; 11-18
    Format: text
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    NASA TECHNICAL REPORTS
  • 2
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    Magnetic properties of superconducting GdBa2Cu3O(6 + delta) at low temperature and high field (1988)
    In:  Other Sources
    Details
    Publication Date: 2019-07-13
    Description: The magnetization of antiferromagnetic superconducting GdBa2Cu3O(6 + delta) has been measured for T in the range of 1.5 - 4.2 K for magnetic fields up to about 20 T. It is found that all Gd(3+) spins are nearly parallel at very high fields, and that this saturated spin subsystem coexists with superconductivity. Below the Neel temperature, 2.22 K, the transition from the 'canted' phase to the paramagnetic phase is observed by the application of a high magnetic field. The temperature dependence of this phase transition is also reported.
    Keywords: SOLID-STATE PHYSICS
    Type: High-temperature superconductors; Nov 30, 1987 - Dec 04, 1987; Boston, MA; United States
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  • 3
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    Electron microscopy of a Gd-Ba-Cu-O superconductor (1989)
    In:  Other Sources
    Details
    Publication Date: 2019-07-12
    Description: An electron microscopy study has been carried out to characterize the microstructure of a sintered Gd-Ba-Cu-O superconductor alloy. The GdBa2Cu3O(7-x) phase in the oxygen annealed sample is orthorhombic, while in the vacuum annealed sample it is tetragonal. It is shown that the details of the fine structure in the 001-line zone axis convergent beam patterns can be used to distinguish between the orthorhombic form and the tetragonal form. In addition to this matrix phase, an amorphous phase is frequently observed at the triple grain junctions. Gd-rich inclusions have been observed inside the matrix phase.
    Keywords: SOLID-STATE PHYSICS
    Type: Journal of Materials Research (ISSN 0884-2914); 4; 515-520
    Format: text
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  • 4
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    Superconductivity at 52.5 K in the lanthanum-barium-copper-oxide system (1987)
    In:  Other Sources
    Details
    Publication Date: 2019-07-12
    Description: The electrical properties of the (La/0/9/Ba/0.1/)CuO/4-y/ system are examined under ambient and hydrostatic pressures. The resistance, ac magnetic susceptibility, and superconductivity onset, midpoint, and intercept temperatures are measured. It is observed that at ambient pressure the resistance decreases with temperature decreases, and the ac susceptibility shows diamagnetic shifts starting at about 32 K. Under hydrostatic pressure a superconducting transition with an onset temperature of 52.5 K is observed, and the resistance increases at lower temperatures. The data reveal that the electrical properties of the La-Ba-Cu-O system are dependent on samples and preparation conditions. Various causes for the high temperature superconductivity of the system are proposed.
    Keywords: SOLID-STATE PHYSICS
    Type: Science (ISSN 0036-8075); 235; 567-569
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  • 5
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    Evidence for superconductivity above 40 K in the La-Ba-Cu-O compound system (1987)
    In:  Other Sources
    Details
    Publication Date: 2019-07-12
    Description: An apparent superconducting transition with an onset temperature above 40 K has been detected under pressure in the La-Ba-Cu-O compound system synthesized directly from a solid-state reaction of La2O3, CuO, and BaCO3 followed by a decomposition of the mixture in a reduced atmosphere. The experiment is described and the results of effects of magnetic field and pressure are discussed.
    Keywords: SOLID-STATE PHYSICS
    Type: Physical Review Letters (ISSN 0031-9007); 58; 405-407
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  • 6
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    Upper critical field of high temperature Y(1.2)Ba(0.8)CuO(4-delta) superconductor (1987)
    In:  Other Sources
    Details
    Publication Date: 2019-07-12
    Description: A 20-T high-field magnet is used to measure electrical resistance as a function of temperature in the Y(1.2)Ba(0.8)CuO(4-delta) superconductor. The temperature dependence of the critical field, Hc2(T), is obtained from the superconduction transition. A Hc2(O) value of 166T is determined which is the highest critical field yet reported. Results show Y(1.2)Ba(0.8)CuO(4-delta) to be a 90K Type-II superconductor, with a lower critical field Hc1(O) of about 0.2T and a penetration depth of about 290 A.
    Keywords: SOLID-STATE PHYSICS
    Type: Applied Physics Communications (ISSN 0277-9374); 7; 3 19; 129-133
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  • 7
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    Superconductivity up to 114 K in the Bi-Al-Ca-Sr-Cu-O compound system without rare-earth elements (1988)
    In:  Other Sources
    Details
    Publication Date: 2019-07-12
    Description: Stable superconductivity up to 114 K has been reproducibly detected in Bi-Al-Ca-Sr-Cu-O multiphase systems without any rare-earth elements. Pressure has only a slight positive effect on T(c). These observations provide an extra material base for the study of the mechanism of high-temperature superconductivity and also the prospect of reduced material cost for future applications of superconductivity.
    Keywords: SOLID-STATE PHYSICS
    Type: Physical Review Letters (ISSN 0031-9007); 60; 941-943
    Format: text
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