An anomaly in the superconducting phase of UPd₂Al₃

Abstract

We reported previously that an anomaly appeared in the specific heat of UPd₂Al_3.03 in the superconducting state. An anomaly has also been observed in the thermal expansion of a sample, which was cut from the same ingot of UPd₂Al_3.03 revealing de Haas-van Alphen oscillations. The temperature dependence of the magnetic susceptibility of La_0.25U_0.75Pd₂Al₃ shows no peak down to about 5 K contrary to that of UPd₂Al₃, implying a nonsinglet ground state.