Surface State and Normal Layer Effects

R. A. Klemm；M. Ledvij；S. H. Liu

Chinese Journal of Physics

34卷2S期（1996 / 04 / 01）

201 - 211

英文

In addition to the conducting CuO2(S) layers, most high-T, superconductors also contain other conducting (N) Iayers, which are only superconducting due to the proximity effect. The combination of S and N layers can give rise to complicated electronic densities of states, leading to quasilinear penetration depth and NMR relaxation rate behavior at low temperatures. Surface states can also complicate the analysis of tunneling and photoemission measurements. Moreover, geometrical considerations and inhomogeneously trapped flux are possible explanations of the paramagnetic Meissner effect and of corner and ring SQUID experiments. Hence, all of the above experiments could be consistent with isotropic s-wave superconductivity within the S layers.