Characteristics of Holes Investigated by ESR in High-Tcphase of Bi(Pb)-Sr-Ca-Cu-O System

Abstract
Measurements of nonresonant and ESR absorption are made in the high-Tcphase of the Bi(Pb)-Sr-Ca-Cu-O system. Two components of ESR signals have been detected above the superconducting transition temperatureTc. One is anisotropic and the other is isotropic. The isotropic spectrum is not considered to arise from impurities. The nonresonant microwave absorption near zero magnetic field is greatly enhanced atTcand the ESR signals are almost completely masked. The origin of the ESR is discussed in relation to doped holes.