Pseudogap in Bi2Sr2CaCu2O8+δ studied by measuring anisotropic susceptibilities and out-of-plane transport

find in the Bi2Sr2CaCu2O8+delta system that the characteristic temperatures T-chi* [below which the uniform susceptibilities chi(ab)(T) (H perpendicular to c) and chi(c)(T) (H parallel to c) decrease] and T-rho c* [below which the out-of-plane resistivity rho(c)(T) shows typical upturn] coincide for all doping levels. We attribute the T dependence of chi's and rho(c), to the anomalous (pseudogapped) density of states (DOS) in high-T-c cuprates, Furthermore, the anisotropy in the T dependence of chi's is universal, i.e., chi, proportional to 1.6 chi(ab), showing that there is only a single T-dependent component in the chi's. This implies that the Curie-like behavior (d chi/dT < 0) observed in overdoped samples is also caused by a DOS effect.