Temperature dependence of the magnetic field penetration depth in YBCO: comparison with microwave experiments

摘要

Temperature dependence of anisotropic magnetic field penetration depth of a two-band superconductor is calculated in the model of a strong s-wave pairing interaction in one of the bands (S band) and induced superconductivity in the second band (N band). The results of the calculations are compared with the experimental data on the ab- plane and c- axis penetration depth in Yba_2Cu_3O_(7-δ).It is shown that all recent measurements in the whole temperature range are consistent with the two band model.