Upper critical fields and anisotropy limits of high-T/sub c/ superconductors R/sub 1/Ba/sub 2/Cu/sub 3/O/sub 7-//sub y/, where R = Nd, Eu, Gd, Dy, Ho, Er, and Tm, and

Journal Article · Sat Aug 01 00:00:00 EDT 1987 · Phys. Rev. B: Condens. Matter; (United States)

DOI:https://doi.org/10.1103/PhysRevB.36.2394· OSTI ID:5905551

Orlando, T P; Delin, K A; Foner, S; McNiff, Jr, E J; Tarascon, J M; Greene, L H; McKinnon, W R; Hull, G W

The upper critical fields B/sub c//sub 2/(T) were measured up to 28 T for R/sub 1/Ba/sub 2/Cu/sub 3/O/sub 7-//sub y/ where R = Nd, Eu, Gd, Dy, Ho, Er, and Tm, and for YBa/sub 2/Cu/sub 3/O/sub 7-//sub y/. The midpoints (dB/sub c//sub 2//dT)/sub T //sub = //sub =/ cluster about (2.8 +- 0.2)T/K, the T/sub c/'s = (93 +- 2) K show a slight systematic decrease from Nd to Tm, and the extrapolated values of B/sub c//sub 2/(0) cluster about (160 +- 20) T. The wide range of normal-state resistivities indicates that they are not intrinsic to the superconductor. The anisotropy A = B/sub c//sub 2//sub X//B/sub c2/ is estimated to be less than 12 based on the data for the resistive transition. Criteria for the midpoint resistive transition are also reexamined.

• Research Organization: Department of Electrical Engineering and Computer Science, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139
• OSTI ID: 5905551
• Journal Information: Phys. Rev. B: Condens. Matter; (United States), Vol. 36:4
• Country of Publication: United States
• Language: English

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ANISOTROPY
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