Effect of Ru substitution on the physical properties of La0.6Pr0.1Sr0.3Mn1−xRuxO3 (x = 0.00, 0.05 and 0.15) perovskites

Abstract

Morphology, magnetic, and magnetocaloric properties of La_0.6Pr_0.1Sr_0.3Mn_1−xRu_xO₃ (x = 0.00, 0.05 and 0.15) were experimentally investigated. A solid-state reaction method was used for the preparation of the samples. The microstructure of the samples was determined by scanning electron microscopy SEM. Field-cooled (FC) and zero-field-cooled (ZFC) thermomagnetic curves measured at low field and low temperatures exhibit a cluster spin state. A sensitive response to substituting Ru for Mn is observed in the magnetic and magnetocaloric properties. We found that Ru doping is not powerful enough to reduce the Curie temperature T_C, however, it brings about cluster glass behaviors. A magneto-caloric effect has been calculated in terms of isothermal magnetic entropy change. The maximum entropy change |ΔS^max_M| reaches the highest values of 3.32 J kg⁻¹ K⁻¹, 3.11 J kg⁻¹ K⁻¹ and 2.57 J kg⁻¹ K⁻¹ in a magnetic field. However, the relative cooling power decreases with Ru content from 227.44 J kg⁻¹ to 214.14 J kg⁻¹ and then to 188.68 J kg⁻¹ for x = 0.00, 0.05 and 0.15 compositions, respectively.