Quasi-two-dimensional transport properties of the layered superconductor Nd2−xCe x CuO4+δ

摘要: The temperature dependences of resistivities ρab in the ab plane and ρc along c axis have been studied for single-crystal Nd2 − x CexCuO4 + δ (x = 0.12, 0.15, 0.17, 0.20) films with (001) (1\(\bar 1\)0) orientations. superconducting transition anisotropy coefficient are shown to be maximal optimally annealed samples (the oxygen content is close stoichiometric content, → 0). A combination metallic behavior ρab(T) dependence nonmetallic ρc(T) an intrinsic property substance indication fact that system quasi-two-dimensional. This layered quasi-two-dimensional Anderson dielectric a strongly anisotropic localization radius (R loc ≫ R ). An increase and, hence, degree disorder found decrease resistivity coefficient. Thus, disorder-induced takes place this system.