Magnetic-field penetration depth and the lower critical field of the quasi-two-dimensional superconductor Bi2Sr2CaCu2Oy
A. Maeda, T. Shibauchi, N. Kondo, K. Uchinokura, M. Kobayashi
DOI 10.1103/PhysRevB.46.14234 · Physical Review B
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Abstract
The penetration depth λ and the lower critical field Hc1 were measured in single crystals of Bi2Sr2CaCu2Oy. In contrast to the case of YBa2Cu3O7, the temperature dependence of λ has a large T2 term at low temperatures, where T is the temperature. The temperature dependence of Hc1 was found to be consistent with that of λ. These behaviors deviate from the standard BCS behavior. This strongly suggests the existence of low-energy excitation in the superconducting state. Possible origins, including the importance of the layered structure of the high-Tc cuprates, are discussed.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| Bi2Sr2CaCu2Oy Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 90 | Pressure not reported | midpoint |
| YBa2Cu3O7-δ Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 92 | Pressure not reported | midpoint |
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