High-field measurements on the high-Tc superconductors La1.85Sr0.15CuO4−δ and YBa2Cu3O7−δ
P. J. M. van Bentum, H. van Kempen, L. E. C. van de Leemput, J. A. A. J. Perenboom, L. W. M. Schreurs, P. A. A. Teunissen
DOI 10.1103/PhysRevB.36.5279 · Physical Review B
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Abstract
We have measured the superconductive properties of the high-Tc superconductors La1.85Sr0.15CuO4−δ and YBa2Cu3O7−δ in magnetic fields up to 25 T. Conservative estimates of the critical field at T=0 yield, respectively, 45±5 and 200±25 T. The slope (dBc2dT) near Tc for the Y-Ba-Cu-O compound is about twice as large as in La-Sr-Cu-O. For both compounds the magnetoresistivity indicates a large anisotropy of the critical field. The Sommerfeld parameter γ is estimated to be, respectively, 7 and 16 mJ (moleCu)−1K−2, which indicates that the higher Tc of Y-Ba-Cu-O, when compared with La-Sr-Cu-O, might be due primarily to an increased density of states at the Fermi level.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| La1.85Sr0.15CuO4-δ Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 33 | Pressure unresolved | midpoint |
| YBa2Cu3O7-δ Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 90 | Pressure unresolved | midpoint |
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