Effect of oxygen content on the specific heat and magnetic susceptibility of YBa2Cu3O7−δ

Abstract

The specific heat and magnetic susceptibility of a sample of YBa2Cu3O7−δ (YBCO) was measured for 0≤δ≤0.85, 0.8≤T≤120K, and H=0, 3, 5, 7, 9T. The data show the existence of both S=1/2 and S=2 paramagnetic centers, consistent with EPR results. The δ dependences of their concentrations and of other parameters are reported.