Pseudogap in Bi2Sr2CaCu2O8+d studied by measuring anisotropic susceptibilities and out-of-plane transport
Abstract
We find in the Bi2Sr2CaCu2O8+d system that the characteristic temperatures T*chi [below which the uniform susceptibilities chiab(T) (H perpendicular to c) and chic(T)(H parallel to c) decrease] and T*rhoc (below which the out-of-plane resistivity rhoc(T) shows typical upturn) coincide for all doping levels. We attribute the T dependence of chi's and rhoc to the anomalous (pseudogapped) density-of-states (DOS) in high-Tc cuprates. Furthermore, the anisotropy in the T dependence of chi's is universal, i.e., chic proportional to1.6chiab, showing that there is only a single T-dependent component in the chi's. This implies that the Curie-like behavior (dchi/dT<0) observed in overdoped samples is also caused by a DOS effect.
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