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Properties of La/sub 1. 8/Sr/sub 0. 2/CuO/sub 4/ superconductors

Journal Article · · Appl. Phys. Lett.; (United States)
DOI:https://doi.org/10.1063/1.97932· OSTI ID:6952573
Critical current, critical field, and carrier density measurements have been made on bulk samples of La/sub 1.8/Sr/sub 0.2/CuO/sub 4/ to assess the potential of such oxide superconductors for practical applications. The importance of preparing samples in a high oxygen pressure was documented. The upper critical field at T = 0 was estimated to be 530 kOe. From magnetization hysteresis loops, critical current densities were determined between 0 and 60 kOe. At 60 kOe, the values were 2 x 10/sup 3/ A/cm/sup 2/ at 4.2 K and 4 x 10/sup 2/ A/cm/sup 2/ at 18 K in samples that exhibited characteristics of weak flux pinning. The effective carrier density at 48 K was 1 x 10/sup 21/ cm/sup -3/, approximately half of the expected upper limit. A set of microscopic superconducting parameters has been derived from transition temperature, resistivity, and upper and lower critical field measurements made on a single specimen.
Research Organization:
Westinghouse RandD Center, Pittsburgh, Pennsylvania 15235
OSTI ID:
6952573
Journal Information:
Appl. Phys. Lett.; (United States), Journal Name: Appl. Phys. Lett.; (United States) Vol. 50:16; ISSN APPLA
Country of Publication:
United States
Language:
English

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