Appearance of Superconductivity in Tetragonal Nd1.5Ba1.5Cu3Oy

Abstract
Temperature dependence of magnetic susceptibility for superconducting Nd1.5Ba1.5Cu3O y (T c∼6 K) was measured. The susceptibility of the normal state follows the Curie-Weiss law with µeff=3.0 µB which is smaller than that of the Nd3+ free ion. Susceptibility decreases below 40 K due to the Meissner effect and then increases due to the magnetic effect of the Nd+3 ions.