Observation of spin glass behavior in spinel compound CoGa2O4

Abstract

In this work, the synthesis process, crystal-structure, and comprehensive physical properties of spinel compound CoGa 2 O 4 have been investigated. The competition between antiferromagnetism (AFM) and ferromagnetism (FM) are considered to be the crucial elements for resulting in spin-glass (SG) behavior due to magnetic frustration. The observed SG behavior is determined by the temperature dependence of magnetization M(T) curves under the ZFC (zero-eld-cooled) and FCC ( eld-cooled) processes, where form the intense irreversibility divergence. Moreover, the corresponding tting parameters (the freezing temperature T 0 = 9.32 K, the ipping time τ 0 = 4.49 × 10 -10 s, and the dynamical exponent zν = 4.46) strongly indicate the existence of the SG behavior. Meanwhile, as another speci c characteristic for SG, in our present work, frequency (f) and magnetic eld (H) have a strong in uence on the peaks of AC susceptibility. From where, with the increase of f and H, the freezing temperature follows a corresponding peak shift. All the above phenomena and relevant analyses of magnetic frustration behavior con rm the typical SG behavior in CoGa 2 O 4 system.