Determination of the magnetic field penetration depth in superconducting yttrium barium copper oxide: Deviations from the Bardeen-Cooper-Schrieffer laws
J. R. Cooper, C. T. Chu, L. W. Zhou, B. Dunn, G. Grüner
DOI 10.1103/PhysRevB.37.638 · Physical Review B
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Abstract
We have measured the low-field magnetization for a number of fine powders of Y1Ba2Cu3O7−δ and applied a standard formula to determine the magnetic field penetration depth λ(T) in the superconducting state. Consistent values of λ(0) and similar temperature dependences λ(T) are obtained for average particle diameters ranging from 1.1 to 9 μm. At low temperatures λ(T) is not Bardeen-Cooper-Schrieffer-like, instead a T2 law is observed. The implications of this result are discussed.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| Y1Ba2Cu3O7-δ Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 90 | Pressure not reported | unknown |
| UBe13 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | — | Pressure not reported | unknown |
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