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. © 2007 The American Physical Society.
CITATION STYLE
Khasanov, R., Strässle, S., Di Castro, D., Masui, T., Miyasaka, S., Tajima, S., … Keller, H. (2007). Multiple gap symmetries for the order parameter of cuprate superconductors from penetration depth measurements. Physical Review Letters, 99(23). https://doi.org/10.1103/PhysRevLett.99.237601
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