Large magnetic entropy in giant magnetoresistive amorphous gadolinium silicon

Authors
Zink, BL Janod, E Allen, K Hellman, F
Citation
Bl. Zink et al., Large magnetic entropy in giant magnetoresistive amorphous gadolinium silicon, PHYS REV L, 83(11), 1999, pp. 2266-2269
Citations number
21
Categorie Soggetti
Physics
Journal title
PHYSICAL REVIEW LETTERS
ISSN journal
00319007 → ACNP
Volume
83
Issue
11
Year of publication
1999
Pages
2266 - 2269
Database
ISI
SICI code
0031-9007(19990913)83:11<2266:LMEIGM>2.0.ZU;2-T
Abstract
We report results of specific heat measurements from 5 to 70 K on thin film s of the giant negative magnetoresistive spin glass a-GdxSi1-x and its nonm agnetic analog a-YxSi1-x. The specific heat of a-GdxSi1-x samples is signif icantly greater than that of a-YxSi1-x samples below 50 K. The resulting ma gnetic entropy of a-GdxSi1-x exceeds the total calculated entropy available from Gd moments alone. We suggest that the additional entropy is provided by the interaction of barely localized electron spins with the Gd moments.