Measurements of the temperature dependence of the magnetic penetration depth in YBa2Cu3O7−δ superconducting thin films
Steven M. Anlage, Brian W. Langley, Guy Deutscher, Jürgen Halbritter, M. R. Beasley
DOI 10.1103/PhysRevB.44.9764 · Physical Review B
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Abstract
Using a very sensitive microstrip-resonator technique, we have measured λ(T) of c-axis YBa2Cu3O7−δ films on various substrates and compared the results to similar data on Nb and NbCN films. For YBa2Cu3O7−δ, λ(T) is found to be exponential and not power law in its temperature dependence (for T<Tc/2) in the best films. Overall the data cannot be described by a single-gap BCS temperature dependence. The data at low temperature provide a lower limit of 2Δ(0)/kBTc≊2.5 for the minimum gap in Yba2Cu3O7−δ, yet show strong-coupling-like behavior at high temperatures. We discuss our results in the context of other experiments on the cuprate superconductors.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| YBa2Cu3O7-δ Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | — | Pressure not reported | unknown |
| Nb Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | — | Pressure not reported | unknown |
| NbCN 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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