Large magnetic-entropy change above room temperatureS irn0 .t3hMe cno1l-oxsNsai lx mOa3g mneattoerreisailsstance La0.7

Abstract

Magnetic and magnetocaloric properties of the series La 0.7Sr0.3Mn1-xNixO3 (x = 0.00, 0.01, 0.02, 0.03, and 0.05) have been investigated. The X-ray diffraction analysis shows that all perovskites studied have the rhombohedral structure. The field-cooled and zero-field-cooled thermomagnetic curves measured at low field show that there is spin-glass (or cluster-glass)-like state in the samples. It is found that the magnetic-entropy change |??Smax| has reached the highest value of 3.54J/kgK at 13.5kOe for the composition with x = 0.02. ?? 2004 Elsevier B.V. All rights reserved.