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Ferromagnetic ordering and Griffiths-like phase behavior in Gd5Ge3.9Al0.1

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5 Author(s)
Zou, J.D. ; The Ames Laboratory, US Department of Energy, Iowa State University, Ames, Iowa 50011-3020, USA ; Liu, J. ; Mudryk, Y. ; Pecharsky, V.K.
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Gd5Ge3.9Al0.1 crystallizes in the Sm5Ge4-type structure at room temperature, but unlike the parent Gd5Ge4 that remains antiferromagnetic in a zero magnetic field down to at least 2 K, the ground state of the Al-substituted compound is ferromagnetic. The Curie temperature of Gd5Ge3.9Al0.1 is nearly the same as that of Gd5Ge4 in a 50 kOe magnetic field. The Griffiths-like phase behavior is observed in both Gd5Ge4 and Gd5Ge3.9Al0.1 compounds. Compared with Gd5Ge4, the Néel temperature of the aluminum-substituted compound decreases by 2 K, while the onset temperature of the Griffiths-like phase decreases by 5 K. Substitution of Al for Ge increases the magnetocaloric effect of Gd5Ge4, and the entropy change peak shifts from 41 K to 49 K.

Published in:

Journal of Applied Physics  (Volume:114 ,  Issue: 6 )