Upper critical fields of high-Tc superconducting La2−xSrxCuO4−y: Possibility of 140 tesla
T. P. Orlando, K. A. Delin, S. Foner, E. J. McNiff, Jr., J. M. Tarascon, L. H. Greene, W. R. McKinnon, G. W. Hull
DOI 10.1103/PhysRevB.35.5347 · Physical Review B
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Abstract
The upper critical fields Bc2(T) of La2−xSrxCuO4(x=0.15 and x=0.20) were measured near Tc 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 &=2.2 T/K, Tc=38.1 K, and Bc2(0)=58 T assuming a dirty type-II superconductor with no Pauli paramagnetic limiting. Data for the onset yield 4.5±0.5 K−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 Bc2(T) are presented and experimental limitations of measurements in these high-field superconductors are indicated.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| La2-xSrxCuO4 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 38.1 | Pressure not reported | midpoint |
| La2-xSrxCuO4 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 40.1 | Pressure not reported | onset |
| La2-xSrxCuO4 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 34.8 | Pressure not reported | midpoint |
| La1.85Sr0.15CuO4 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 34.7 | Pressure not reported | midpoint |
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