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Thermal expansion of the magnetorefrigerant Gd5(Si,Ge)4

✍ Scribed by M. Nazih; A. de Visser; L. Zhang; O. Tegus; E. Brück

Publisher
Elsevier Science
Year
2003
Tongue
English
Weight
145 KB
Volume
126
Category
Article
ISSN
0038-1098

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✦ Synopsis

We report thermal expansion measurements carried out on a single-crystal of the giant magnetocaloric effect material Gd 5 (Si 0.43 Ge 0.57 ) 4 . At the magneto-structural phase transition at T 0 , 240 K; large steps in the relative length change DL=L along the principle crystallographic axes are observed. The single-step behaviour in DL=L indicates that the magnetic and the structural phase transition occur at one and the same temperature. The specific heat was measured in order to determine the latent heat. Using the Clausius -Clapeyron relation, we extract a hydrostatic pressure dependence dT 0 =dP of 3.2 ^0.2 K/kbar. The pressure effect is strongly anisotropic as follows from the anisotropy in the linear thermal expansion. Uniaxial pressure along the a-axis enhances T 0 ; while uniaxial pressure in the bc-plane suppresses T 0 :

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