Spin–glass behavior in Shastry–Sutherland lattice of Tm[formula omitted]Cu[formula omitted]In

Abstract

The spin–glass behavior in the ferromagnetic phase of Tm2Cu2In was investigated by dc–, ac–magnetization, and non-equilibrium dynamics characterizations. An argon arc–melted polycrystalline sample of the compound of Tm2Cu2In was found to adopt the Mo2FeB2–type tetragonal structure (space group P4/mbm). The temperature variation of dc–magnetization exhibits a ferromagnetic behavior with Curie temperature TC = 32.5 K. The zero field cooled (ZFC) and field cooled (FC) magnetic curves show the thermomagnetic irreversible behavior below TC. The field dependence of irreversible temperature follows the Almeida–Thouless line. The frequency and ac–driven field dependent anomalies in ac–susceptibility results indicate the existence of a spin–glass state in Tm2Cu2In. The time dependence of magnetization further supports the spin–glass behavior observed in Tm2Cu2In. The frequency dependence of the freezing temperature in the real part of ac–susceptibility has been analyzed on the basis of a power–law divergence and Vogel–Fulcher law. The obtained results reveal that Tm2Cu2In belongs to the ferromagnetic canonical spin–glass class of compounds.