Magnetic Properties of YBa₂(Cu_1-xFe_x)₃O_y

Abstract

The static magnetic susceptibility of YBa 2 (Cu 1- x Fe x ) 3 O y in the normal state was measured for both slowly cooled superconducting specimens and quenched semiconductor-like specimens. The susceptibility is found to be expressed by the sum of the Curie-Weiss term and a temperature-independent paramagnetic term, χ 0 , for both types of specimen. The Curie constant and χ 0 increase with an increasing iron concentration. No anomaly showing magnetic ordering was observed.