Spin glass behavior and dielectric properties of Sm2CuMnO6 perovskites

Abstract

Monoclinic Sm2CuMnO6 is a fascinating material that exhibits intriguing magnetic and dielectric properties. In this study, we investigated the magnetic transition, conduction mechanism, and dielectric behavior of the material. Mott's variable range hopping of polarons is proposed as a satisfactory explanation for the conduction process, shedding light on the underlying charge transport mechanism. Furthermore, the material displays a spin glass transition at a freezing temperature of Tf = 18 K, suggesting the presence of competing magnetic interactions. Dielectric measurements reveal intriguing temperature and frequency dependence of the dielectric constant (ε) in Monoclinic Sm2CuMnO6. Below 100 K, the dielectric constant remains unchanged with variations in both temperature and frequency, indicating a stable dielectric response. However, above 100 K, ε exhibits an increasing trend with rising temperature and also displays frequency dependence. This behavior suggests the contribution of both deformational and relaxation polarizations, emphasizing the complex nature of the dielectric response.