Magnetocaloric effect in Tb-5(SixGe1-x)(4)

Citation
L. Morellon et al., Magnetocaloric effect in Tb-5(SixGe1-x)(4), APPL PHYS L, 79(9), 2001, pp. 1318-1320
Citations number
31
Language
INGLESE
art.tipo
Article
Categorie Soggetti
Apllied Physucs/Condensed Matter/Materiales Science
Journal title
APPLIED PHYSICS LETTERS
ISSN journal
0003-6951 → ACNP
Volume
79
Issue
9
Year of publication
2001
Pages
1318 - 1320
Database
ISI
SICI code
0003-6951(20010827)79:9<1318:MEIT>2.0.ZU;2-3
Abstract
The magnetocaloric effect has been investigated in a series of the R-5(SixG e1-x)(4) pseudobinary alloys with R=Tb and x=0.0, 0.5, and 1.0. In Tb5Si4 a nd Tb5Ge4, a maximum magnetic entropy change of 9.8 and 3.7 J/kg K, respect ively, has been found at their ordering temperatures for a magnetic field c hange of 50 kOe. In the case of Tb5Ge4, we have observed the existence of a previously unreported magnetic transition below the Neel temperature. Tb-5 (Si0.5Ge0.5)(4) has been successfully synthesized, and a large entropy chan ge of 21.8 J/kg K (DeltaH=50 kOe) is achieved at a first-order para- to fer romagnetic transition, T(C)congruent to 105 K. This study demonstrates that Tb-5(SixGe1-x)(4) alloys are good candidates for magnetic refrigeration an d that very exciting phenomenology in these systems awaits further investig ation. (C) 2001 American Institute of Physics.