Direct measurement of the "giant" adiabatic temperature change in Gd5Si2Ge2

Authors
Giguere, A Foldeaki, M Gopal, BR Chahine, R Bose, TK Frydman, A Barclay, JA
Citation
A. Giguere et al., Direct measurement of the "giant" adiabatic temperature change in Gd5Si2Ge2, PHYS REV L, 83(11), 1999, pp. 2262-2265
Citations number
19
Categorie Soggetti
Physics
Journal title
PHYSICAL REVIEW LETTERS
ISSN journal
00319007 → ACNP
Volume
83
Issue
11
Year of publication
1999
Pages
2262 - 2265
Database
ISI
SICI code
0031-9007(19990913)83:11<2262:DMOT"A>2.0.ZU;2-D
Abstract
Direct adiabatic temperature change as well as magnetic measurements were c arried out on two different samples of Gd5Si2Ge2 composition for which calc ulations predicted a "giant" magnetocaloric effect (MCE). While magnetic me asurements well reproduce published values, serving the basis for the predi ctions, direct adiabatic temperature change measurements show a significant ly smaller MCE. The discrepancy can be interpreted on the basis of the ther modynamics of first order magnetic transitions.