TITLE

Magnetocaloric effect in Tb[sub 5](Si[sub x]Ge[sub 1-x])[sub 4]

AUTHOR(S)
Morellon, L.; Magen, C.; Algarabel, P. A.; Ibarra, M. R.; Ritter, C.
PUB. DATE
August 2001
SOURCE
Applied Physics Letters;8/27/2001, Vol. 79 Issue 9, p1318
SOURCE TYPE
Academic Journal
DOC. TYPE
Article
ABSTRACT
The magnetocaloric effect has been investigated in a series of the R[sub 5](Si[sub x]Ge[sub 1-x])[sub 4] pseudobinary alloys with R=Tb and x=0.0, 0.5, and 1.0. In Tb[sub 5]Si[sub 4] and Tb[sub 5]Ge[sub 4], a maximum magnetic entropy change of 9.8 and 3.7 J/kg K, respectively, has been found at their ordering temperatures for a magnetic field change of 50 kOe. In the case of Tb[sub 5]Ge[sub 4], we have observed the existence of a previously unreported magnetic transition below the Ne´el temperature. Tb[sub 5](Si[sub 0.5]Ge[sub 0.5])[sub 4] has been successfully synthesized, and a large entropy change of 21.8 J/kg K (ΔH=50 kOe) is achieved at a first-order para- to ferromagnetic transition, T[sub C]≅105 K. This study demonstrates that Tb[sub 5](Si[sub x]Ge[sub 1-x])[sub 4] alloys are good candidates for magnetic refrigeration and that very exciting phenomenology in these systems awaits further investigation. © 2001 American Institute of Physics.
ACCESSION #
5045898

 

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