Upper critical fields of high-T/sub c/ superconducting La/sub 2-//sub x/Sr/sub x/CuO/sub 4-//sub y/: Possibility of 140 tesla

Journal Article · Wed Apr 01 00:00:00 EST 1987 · Phys. Rev. B: Condens. Matter; (United States)

DOI:https://doi.org/10.1103/PhysRevB.35.5347· OSTI ID:5828484

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) of La/sub 2-//sub x/Sr/sub x/CuO/sub 4/(x = 0.15 and x = 0.20) were measured near T/sub c/ in dc fields to 23 T and at 4.2 K with pulsed fields to 45 T. Resistive midpoint transitions for the x = 0.15 sample yield (dB/sub c//sub 2//dT)/sub T //sub = //sub =/ = 2.2 T/K, T/sub c/ = 38.1 K, and B/sub c//sub 2/(0) = 58 T assuming a dirty type-II superconductor with no Pauli paramagnetic limiting. Data for the onset yield 4.5 +- 0.5 K/sup -1/, 40.1 K, and 125 +- 15 T, respectively. Pulsed-field data show that fractions of both materials are superconducting above 45 T at 4.2 K. Calculations of limits of B/sub c//sub 2/(T) are presented and experimental limitations of measurements in these high-field superconductors are indicated.

• Research Organization: Department of Electrical Engineering and Computer Science, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139
• OSTI ID: 5828484
• Journal Information: Phys. Rev. B: Condens. Matter; (United States), Vol. 35:10
• Country of Publication: United States
• Language: English

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