Temperature dependence of the lower critical field of high-Tc superconducting crystals near Tc
F. Mrowka, M. Wurlitzer, P. Esquinazi, E. Zeldov, T. Tamegai, S. Ooi, K. Rogacki, B. Dabrowski
DOI 10.1103/PhysRevB.60.4370 · Physical Review B
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Abstract
We have measured the nonlinear susceptibility of YBa2Cu4O8, Bi2Sr2CaCu2O8, and untwinned YBa2Cu3O7 crystals near the superconducting critical temperature Tc in order to determine the lower critical field Hc1(T). The ac field amplitude dependence of the susceptibility for homogeneous YBa2Cu4O8 and Bi2Sr2CaCu2O8 crystals is in agreement with the geometrical barrier model allowing us to determine the penetration field Hp(T)∝Hc1(T). We clearly show that in these crystals the previously reported breakdown of Hc1 near Tc coincides with the low-temperature ac field amplitude independent onset of the superconducting transition. We show that this anomalous behavior of Hc1(T) is due to the influence of inhomogeneities and it is not an intrinsic property. We have also investigated the influence of the earth field on the nonlinear susceptibility, and we demonstrate the importance of its shielding for careful measurements of Hc1 near Tc.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| YBa2Cu4O8 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 78.9 | Pressure not reported | onset |
| Bi2Sr2CaCu2O8 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 90.2 | Pressure not reported | onset |
| Bi2Sr2CaCu2O8 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 90.6 | Pressure not reported | onset |
| Bi2Sr2CaCu2O8 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 90 | Pressure not reported | onset |
| YBa2Cu3O7 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 89 | Pressure not reported | onset |
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