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  • SOLID-STATE PHYSICS  (4)
  • 1990-1994  (4)
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  • 1990-1994  (4)
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  • 1
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    Unknown
    Annealing temperature and O2 partial pressure dependence of T(sub c) in HgBa2CuO(4+delta) (1994)
    In:  Other Sources
    Details
    Publication Date: 2019-08-28
    Description: Samples of HgBa2CuO(4+delta) (Hg-1201) were annealed under various conditions. After carefully controlling annealing time, annealing temperature (T(sub a)) and O2 partial pressure (P(sub 0)), we were able to find the reversible annealing conditions for Hg-1201. Under 1 atm O2 at 260 C less than or equal to T(sub a) less than or equal to 400 C, the obtained T(sub c) is nearly the same (approximately 97 K). However, it decreases quickly with T(sub a) greater than 300 C in high vacuum (P(sub 0) approximately 10(exp -8) atm), and reaches zero at T(sub a) = 400 C. On the other hand, T(sub c) decreases with the decrease of T(sub a) in high-pressure O2 (approximately 500 atm) and reaches approximately 20 K at about 240 C. In the entire annealing region, the oxygen surplus varies significantly from 0.03 to 0.4, and a wide range of T(sub c) variation (0 goes to 97 K goes to 20 K) was obtained with anion doping alone.
    Keywords: SOLID-STATE PHYSICS
    Type: Journal of Applied Physics (ISSN 0021-8979); 76; 10:00 PM; p. 7127-7129
    Format: text
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    NASA TECHNICAL REPORTS
  • 2
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    Unknown
    An electron diffraction study of Bi2Sr2(Gd/x/Ca/1-x/)0.8Cu2O(8+delta) (1990)
    In:  Other Sources
    Details
    Publication Date: 2019-07-12
    Description: The compound Bi2Sr2(Gd/x/Ca/1-x/)0.8Cu2O(8+delta) is examined by electron diffraction for several values of x. The incommensurate modulation which has been reported for x = 0 persists for all values of x with the wave vector increasing as x increases. A secondary modulation with a wave vector equal to one-half that of the primary is observed for x equal to or greater than 0.85. This modulation manifests itself through satellite reflections that are highly streaked normal to the (001) planes and that flank certain select positions in reciprocal space. The appearance of this secondary modulation is accompanied by a change in the average crystal structure from B-centered to F-centered orthorhombic.
    Keywords: SOLID-STATE PHYSICS
    Type: Journal of Materials Research (ISSN 0884-2914); 5; 1625-163
    Format: text
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    NASA TECHNICAL REPORTS
  • 3
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    Unknown
    Comparison between the magnetic and transport critical current densities in high critical current density melt-textured yttrium barium copper-oxide (1991)
    In:  Other Sources
    Details
    Publication Date: 2019-07-12
    Description: Using a recently developed pulsed critical current density (Jc) measuring system, the Jc of the high-Jc melt-textured YBa2Cu3O(7-delta) (Y123) bulk samples has been determined. I-V curves with a voltage resolution of 0.5 microV were obtained, and transport Jc's along the a-b plane as high as 7.2 x 10 to the 4th A/sq cm were extracted. These results are comparable to the values obtained magnetically. On the other hand, transport Jc along the c axis were found to be two orders of magnitude smaller, even though the magnetic Jc along the c axis is only about five times smaller than Jc along the a-b plane. It is suggested that for the high-temperature superconducting materials which are highly anisotropic, caution should be taken when using the nontransport magnetic methods to determine Jc.
    Keywords: SOLID-STATE PHYSICS
    Type: Applied Physics Letters (ISSN 0003-6951); 58; 92-94
    Format: text
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  • 4
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    High magnetic field trapping in monolithic single-grain YBa2Cu3O(7-delta) bulk materials (1993)
    In:  Other Sources
    Details
    Publication Date: 2019-08-27
    Description: Results of our study on high magnetic field trapping in unirradiated, high quality monolithic single-grain YBa2Cu3O(7-delta) disks are reported. A record high 4 T trapped field at the surface of the unirradiated disks is observed. However, below 11 K, large flux avalanches caused by thermal instability severely limit the remnant trapped field. Therefore, flux avalanche, rather than Jc x d, dictates the maximum trapped field at low temperatures. To overcome this problem, a strong high temperature superconductor trapped field magnet is proposed. A novel application of the avalanche effect is also mentioned.
    Keywords: SOLID-STATE PHYSICS
    Type: Applied Physics Letters (ISSN 0003-6951); 63; 2; p. 260-262.
    Format: text
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