Magnetocaloric effect of half-doped manganite Nd0.5Ca0.25Sr0.25MnO3

In the present work, the magnetic entropy change of the half-doped Nd0.5Ca0.25Sr0.25MnO3 manganite has been investigated. The measurement of isothermal magnetization around Curie temperature reveals the maximum isothermal magnetic entropy change of 1.85 and 0.77 J/kg K for Delta H = 3.0 and 1.0T magnetic field variation, respectively. In addition, from the data of heat capacity, we find the adiabatic temperature change of 0.88 K for a magnetic field variation of 3.0T. Though only a moderate magnetic entropy change and a small adiabatic temperature change were obtained, a considerable large relative cooling power (140 J/kg as Delta H = 3.0T) and a wide temperature range (74 K as Delta H = 3.0T) were found in this sample, this ensure it to be a promising candidate for the actual magnetic refrigerant materials. Crown Copyright (C) 2010 Published by Elsevier B.V. All rights reserved.