Giant magnetocaloric effect near the Curie temperature in the Sm0.6Sr0.4MnO3 manganite

Citation
Ai. Abramovich et al., Giant magnetocaloric effect near the Curie temperature in the Sm0.6Sr0.4MnO3 manganite, PHYS SOL ST, 43(4), 2001, pp. 715-717
Citations number
12
Categorie Soggetti
Apllied Physucs/Condensed Matter/Materiales Science
Journal title
PHYSICS OF THE SOLID STATE
ISSN journal
10637834 → ACNP
Volume
43
Issue
4
Year of publication
2001
Pages
715 - 717
Database
ISI
SICI code
1063-7834(200104)43:4<715:GMENTC>2.0.ZU;2-M
Abstract
A method is proposed for the calculation of the magnetocaloric effect from simultaneous measurements of thermal expansion and magnetostriction made in different regimes (adiabatic and isothermal). The magnitude of the magneto caloric effect for Sm0.6Sr0.4MnO3 is estimated. It is found that near the C urie temperature T-C it passes through a maximum to reach a giant value Del taT = 4.6 K for DeltaB = 0.84 T. In addition, in the neighborhood of T-C, w e observed colossal magnetoresistance Delta rho/rho = [rho (H) - rho (0)]/r ho (0) = 72% in a weak magnetic field of 0.84 T, a giant negative volume ma gnetostriction omega = -5 x 10(-4) in a field of the same strength, and a l arge change in the sample volume DeltaV/V approximate to 0.1%. (C) 2001 MAI K "Nauka/lnterperiodica".