Investigation of the CuO2 planes in the normal state of the 110K superconductor (Bi, Pb)₂Sr₂Ca₂Cu₃O_y by 170 NMR

Abstract

¹⁷O NMR spectra are obtained in a powdered sample of (Bi, Pb)₂Sr₂Ca₂Cu₃O_y, and resonance lines from oxygen sites in the two unequivalent CuO₂ planes are clearly distinguished. The results presented here concerning the temperature dependence of the corresponding Knight shifts, i.e., of the local spin susceptibility of the two types of CuO₂ planes, are consistent with the existence of an inhomogeneous charge carriers distribution among the two types of CuO₂ planes.