Magnetic Relaxation in Diluted Triangular Antiferromagnet LuFeMgO_4

Abstract

We observed a few magnetic relaxation phenomena in a LuFeMgO₄single crystal, that is, the difference in the magnetization betweenfield-cooled and zero-field-cooled specimens, the appearance ofthermoremanent magnetization, and the frequency dependence of the cusptemperature of AC susceptibility. The observed relaxation wasinterpreted in terms of thermal fluctuations and freezing of themagnetic clusters which are supposed to exist in this substance.