Spin Glass State of Mn_<i>x</i>Ni_1-<i>x</i>Sb: Synthesis in High Pressure and High Temperature Atmospheres

Abstract

The solid solution between ferromagnetic MnSb and paramagnetic NiSb, Mn x Ni 1- x Sb (0≤ x ≤1.0), with NiAs structure was synthesized in high pressure and high temperature atmospheres. The decomposition temperature was determined to be 420∼480 K. The critical concentration of ferromagnetism was obtained to be x c =0.65 at absolute zero. A new type spin glass state with double transition points, T sg1 and T sg2 , was found in a wide range of 0.2≤ x ≤0.65 in the paramagnetic phase. The maximum transition point was estimated to be T sg1 =60 K and T sg2 =190 K. The electrical resistivity showed no anomaly corresponding to T sg1 and T sg2 , and the temperature dependence in the spin glass state was given to be T 2 and T 3/2 at lower temperature. Some discussions are given for the experimental results.