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  • 1
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    Oxygen stabilization induced enhancement in J(sub c) and T(sub c) of superconducting oxides (1990)
    In:  CASI
    Details
    Publication Date: 2013-08-31
    Description: In an attempt to enhance the electrical and mechanical properties of the high temperature superconducting oxides, high T(sub c) composites were prepared composed of the 123 compounds and AgO. The presence of extra oxygen due to the decomposition of AgO at high temperature is found to stabilize the superconducting 123 phase. Ag is found to serve as clean flux for grain growth and precipitates as pinning center. Consequently, almost two orders of magnitude enhancement in critical current densities were also observed in these composites. In addition, these composites also show much improvement in workability and shape formation. On the other hand, proper oxygen treatment of Y5Ba6Cu11Oy was found to possibly stabilize superconducting phase with T(sub c) near 250 K. I-V, ac susceptibility, and electrical resistivity measurements indicate the existence of this ultra high T(sub c) phase in this compound. Detailed structure, microstructure, electrical, magnetic and thermal studies of the superconducting composites and the ultra high T(sub c) compound are presented and discussed.
    Keywords: SOLID-STATE PHYSICS
    Type: NASA, Goddard Space Flight Center, AMSAHTS 1990: Advances in Materials Science and Applications of High Temperature Superconductors; p 8
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  • 2
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    Processing of strong flux trapping high T(subc) oxide superconductors: Center director's discretionary fund (1989)
    In:  CASI
    Details
    Publication Date: 2019-06-28
    Description: Magnetic suspension effect was first observed in samples of YBa2Cu3O7/AgO(Y-123/AgO) composites. Magnetization measurements of these samples show a much larger hysteresis which corresponds to a large critical current density. In addition to the Y-123AgO composites, recently similar suspension effects in other RE-123/AgO, where RE stands for rare-Earth elements, were also observed. Some samples exhibit even stronger flux pinning than that of the Y-123/AgO sample. An interesting observation was that in order to form the composite which exhibits strong flux trapping effect the sintering temperature depends on the particular RE-123 compound used. The paper presents the detailed processing conditions for the formation of these RE-123/AgO composites, as well as the magnetization and critical field data.
    Keywords: SOLID-STATE PHYSICS
    Type: NASA-TM-100350 , NAS 1.15:100350
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  • 3
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    Oxygen stabilization induced enhancement in superconducting characteristics of high-Tc oxides (1991)
    In:  CASI
    Details
    Publication Date: 2019-06-28
    Description: In an attempt to enhance the electrical and mechanical properties of the high temperature superconducting oxides, high T(sub c) composites were prepared composed of the 123 compounds and AgO. The presence of extra oxygen due to the decomposition of AgO at high temperature is found to stabilize the superconducting 123 phase. Ag is found to serve as clean flux for grain growth and precipitates as pinning center. Consequently, almost two orders of magnitude enhancement in critical current densities were also observed in these composites. In addition, these composites also show much improvement in workability and shape formation. On the other hand, proper oxygen treatment of Y5Ba6Cu11Oy was found to possibly stabilize superconducting phase with T(sub c) near 250 K. I-V, ac susceptibility, and electrical resistivity measurements indicate the existence of this ultra high T(sub c) phase in this compound. Detailed structure, microstructure, electrical, magnetic and thermal studies of the superconducting composites and the ultra high T(sub c) compound are presented and discussed.
    Keywords: SOLID-STATE PHYSICS
    Type: NASA. Goddard Space Flight Center, AMSAHTS 1990: Advances in Materials Science and Applications of High Temperature Superconductors; p 3-17
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  • 4
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    High-temperature processing of oxide superconductors and superconducting oxide-silver oxide composite (1988)
    In:  Other Sources
    Details
    Publication Date: 2019-07-27
    Description: High temperature processing was found to partially convert the green 211 phase oxide to 123 phase. High Tc superconductivity was observed in Bi-Sr-Cu-O and Y-Sr-Cu-O systems prepared using the same heat treatment process. High temperature processing presents an alternative synthetic route in the search for new high Tc superconductors. An unusual magnetic suspension with enhancement in critical current density was observed in the 123 and AgO composite.
    Keywords: SOLID-STATE PHYSICS
    Type: Chemistry of High-Temperature Superconductors II; Sept. 25-30, 1988; Los Angeles, CA; United States
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  • 5
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    Epitaxial growth of InSb (111) on sapphire (0001) (1989)
    In:  Other Sources
    Details
    Publication Date: 2019-07-12
    Description: Indium antimonide has been epitaxially grown directly on sapphire. Reflection high-energy electron diffraction, TEM, and SEM data are presented to show that the indium antimonide layer is epitaxial, has an abrupt interface with the sapphire, and grows in the 111-line direction. Mobility data show room-temperature mobilities as high as 10,000 sq cm/V s from some regions on the wafer.
    Keywords: SOLID-STATE PHYSICS
    Type: Applied Physics Letters (ISSN 0003-6951); 54; 1916
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  • 6
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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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  • 7
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    High Tc composite silver/oxide superconductors (1990)
    In:  Other Sources
    Details
    Publication Date: 2019-07-12
    Description: Factors involved in the strong flux pinning effect of high-Tc YBa2Cu3O7/AgO (Y-123/AgO) composite and other REE-123/AgO composites were investigated. Samples of superconducting REE-123 and REE-123/AgO (where REE was Nd, Sm, Eu, Gd, Dy, Ho, Er, or Y) were prepared and used to obtain magnetic moments, critical field, and microstructure data. The optimum heat treatment conditions for the formation of strong flux-pinning REE-123/AgO composites were found to be different for different REE-123 compounds. It was found that the annealing temperature depends on the ionic size of the REE, with larger rare-earth ions requiring higher temperature. It was also found that strong flux-pinning REE-123/AgO composites form only in a narrow annealing temperature range.
    Keywords: SOLID-STATE PHYSICS
    Type: Metallurgical Transactions A - Physical Metallurgy and Materials Science (ISSN 0360-2133); 21A; 257-260
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  • 8
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    Observation of enhanced properties in samples of silver oxide doped YBa2Cu3O(x) (1988)
    In:  Other Sources
    Details
    Publication Date: 2019-07-12
    Description: Samples of YBa2Cu3O(x) doped with silver oxide (Tc is about 93 K) have exhibited attractive forces in gradient magnetic fields, both normal and tangential to the surfaces, which are more than twice the sample weight. This allows sample suspension below a rare earth magnet. Critical current density was increased by about 100 at 77 K. Persistent fields, flux pinning, magnetization, and modeling are described.
    Keywords: SOLID-STATE PHYSICS
    Type: Applied Physics Letters (ISSN 0003-6951); 52; 2066
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  • 9
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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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  • 10
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    Magnetic studies of high Tc superconducting (La0.9Sr0.1)2CuO4-y (1987)
    In:  Other Sources
    Details
    Publication Date: 2019-07-12
    Description: The magnetic moment of La(0.9Sr0.1)2CuO4-y was measured as a function of temperature and magnetic field, and the onset of superconductivity was found to occur at a temperature of 35 K. At 2 K, the dc magnetic susceptibility was found to reach 83 percent of perfect diamagnetism. Field studies have shown that the sample is a type-II superconductor and that the temperature dependences of the critical fiedls are anomalous. Its critical fields, kappa, and lambda(eff) are much larger than those for (La0.9Ba0.1)2CuO4-y, and their temperature dependences cannot be explained in terms of BCS theory.
    Keywords: SOLID-STATE PHYSICS
    Type: Applied Physics Communications (ISSN 0277-9374); 7; 1-2
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