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

Morphology, magnetic, and magnetocaloric properties of La0.6Pr0.1Sr0.3Mn1-xRuxO3 (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 vertical bar Delta S-M(max)vertical bar 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.