Universal observation of multiple order parameters in cuprate superconductors

Details Universal observation of multiple order parameters in cuprate superconductors Universal observation of multiple order parameters in cuprate superconductors

2007-08-17

arxiv.org/abs/0708.2374v1

Phys. Rev. Lett. 99, 237601 (2007)

Physics

Condensed Matter

Superconductivity

5 pages, 3 figures

Scientific paper

10.1103/PhysRevLett.99.237601

The temperature dependence of the London penetration depth \lambda was measured for an untwined single crystal of YBa_2Cu_3O_{7-\delta} along the three principal crystallographic directions (a, b, and c). Both in-plane components (\lambda_a and \lambda_b) show an inflection point in their temperature dependence which is absent in the component along the c-direction (\lambda_c). The data provide convincing evidence that the in-plane superconducting order parameter is a mixture of s+d-wave symmetry whereas it is exclusively 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.

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