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Upper critical fields of high-T/sub c/ superconducting Y/sub 2-//sub x/Ba/sub x/CuO/sub 4-//sub y/

Journal Article · · Phys. Rev. B: Condens. Matter; (United States)
We have measured the upper critical field B/sub c//sub 2/(T) of Y/sub 2-//sub x/Ba/sub x/CuO/sub 4-//sub y/ with x = 0.4 near T/sub c/ in dc fields up to 20 T and at 77 K with pulsed fields to 45 T. The data yield (dB/sub c//sub 2//dT)/sub T //sub = //sub T>c/ = 1.3 T/K and T/sub c/ = 89.5 K for the midpoint of the resistive transitions, and (dB/sub c//sub 2//dT)/sub T //sub = //sub T>c/ = 5 +- 1 T/K and T/sub c/ = 95.1 K for the onset. The estimates for B/sub c//sub 2/(0) range from 80 to 320 T. Pulsed-field data suggest that a fraction of the material is still superconducting above 45 T at 77 K.
Research Organization:
Department of Electrical Engineering and Computer Science, Massachusetts Institute of Technolgy, Cambridge, Massachusetts 02139
OSTI ID:
6089604
Journal Information:
Phys. Rev. B: Condens. Matter; (United States), Journal Name: Phys. Rev. B: Condens. Matter; (United States) Vol. 35:13; ISSN PRBMD
Country of Publication:
United States
Language:
English