Magnetic Properties YBa₂(Cu_1-xCo_x)₃O_y

Abstract

The static magnetic susceptibility of YBa 2 (Cu 1- x Co x ) 3 O y in the normal state was measured for both superconducting (slowly cooled) and semiconductor-like (quenched) samples. The susceptibility was composed of a Curie-Weiss term and a temperature-independent paramagnetic term, χ 0 , for both samples. The Curie constant and χ 0 increased with increasing cobalt concentrations. No anomaly showing magnetic ordering was obserwed. The contribution of the impurity phases such as Y 2 CuBaO 5 to the magnetic susceptibility was found to be negligibly small in our samples by means of ESR technique.