Single crystal growth and physical properties in UPd_2(Al_(1-x)Ga_x)_3

摘要

Measurements of specific heat, electrical resistivity and magnetization for single crystalline samples of UPd_2(Al_(1-x)Ga_x)_3 for Ga concentrations of x <= 0.2 are presented for the first time. As the gallium atom is substituted for the aluminum, the superconducting transition temperature T_c indicates a rapid decrease and the antiferromagnetic transition temperature T_N reduces gradually. We found an entropy released at T_N to decrease with the increase of x, suggesting that the increase of spin fluctuations is responsible for the reduction of T_N. We also discuss the x-dependence of the magnetic susceptibility.