Giant magnetocaloric effect in clathrates

We report an observation of large magnetocaloric effect in clathrate compounds. Systematic dc magnetization in polycrystalline Eu 8 Ga 16 Ge 30 clathrates was studied in the temperature range of 5-60 K and over an applied field range of 0-3 T. Change in entropy ( Δ S mag ) was calculated using the M...

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Bibliographic Details
Published in:Journal of applied physics 2006-04, Vol.99 (8), p.08K902-08K902-3
Main Authors: Srinath, S., Gass, J., Rebar, D. J., Woods, G. T., Srikanth, H., Nolas, G. S.
Format: Article
Language:English
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Summary:We report an observation of large magnetocaloric effect in clathrate compounds. Systematic dc magnetization in polycrystalline Eu 8 Ga 16 Ge 30 clathrates was studied in the temperature range of 5-60 K and over an applied field range of 0-3 T. Change in entropy ( Δ S mag ) was calculated using the Maxwell relation from the family of M - H curves at different temperatures in the vicinity of the ferromagnetic Curie temperatures. Large entropy changes of 6 and 9.3 J ∕ kg K were observed for the type-I and type-VIII phases, respectively. The larger effect in type-VIII samples can be associated with the sharper ferromagnetic transition. Overall, these results indicate that the clathrates known to have potential for excellent thermoelectric properties are also promising candidates as magnetic refrigerant materials.
ISSN:0021-8979
1089-7550
DOI:10.1063/1.2162035