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.
Khasanov, R., Straessle, S., DI CASTRO, D., Masui, T., Miyasaka, S., Tajima, S., et al. (2007). Multiple gap symmetries for the order parameter of cuprate superconductors from penetration depth measurements. PHYSICAL REVIEW LETTERS, 99(23) [10.1103/PhysRevLett.99.237601].
Multiple gap symmetries for the order parameter of cuprate superconductors from penetration depth measurements
DI CASTRO, DANIELE;
2007-12-01
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.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
