Multiple Gap Symmetries for the Order Parameter of Cuprate Superconductors from Penetration Depth Measurements
R. Khasanov, S. Strässle, D. Di Castro, T. Masui, S. Miyasaka, S. Tajima, A. Bussmann-Holder, H. Keller
DOI 10.1103/PhysRevLett.99.237601 · Physical Review Letters
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Abstract
The temperature dependence of the London penetration depth λ was measured for an untwinned single crystal of YBa2Cu3O7−δ along the three principal crystallographic directions (a, b, and c). Both in-plane components (λa−2 and λb−2) show an inflection point in their temperature dependence which is absent in the component along the c direction (λc−2). The data provide convincing evidence that the in-plane superconducting order parameter is a mixture of (s+d)-wave symmetry whereas it is mainly s wave along the c direction. In conjunction with previous results it is concluded that coupled s+d-order parameters are universal and intrinsic to 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. | 91.2 | Pressure not reported | unknown |
| La1-xSrxCuO4 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | — | Pressure not reported | unknown |
| YBa2Cu4O8 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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