Magnetic properties of CeCu_xAl(4-x) and CeCu_xGa_(4-x) single crystals

摘要

Magnetic properties of CeCu_xAl_(4-x) (x=0.8,0.9,1.0 and 1.1) and CeCu_xGa_(4-x) (x=0.7 and 1.0) systems have been investigated by magnetic susceptibility, high-field magnetization, specific heat and electrical resistivity measurements using single crystal samples. In CeCu_xAl_(4-x) the susceptibility and magnetization showed a large anisotropy, the component parallel to the a-axis being larger than that parallel to the c-axis. With decreasing x from x=1, especially X(H||a) showed remarkable increase at low temperatures (development of ferromagnetic correlation), while T_N showed a slight increase. Similar behavior was also observed in CeCu_xGa_(4-x). These results including NMR measurements are discussed in terms of T_K, T_(RKKY) and CEF.