Estimation of second order phase transition temperature of the orthorhombic phase of Gd5(SixGe1−x)4 using Arrott plots

Hadimani, R, Melikhov, Yevgen, Snyder, John Evan and Jiles, David 2008. Estimation of second order phase transition temperature of the orthorhombic phase of Gd5(SixGe1−x)4 using Arrott plots. Journal of Applied Physics 103 (3) , 033906. 10.1063/1.2841728

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Abstract

Gd5(SixGe1−x)4 for 0.41 ⩽ x ⩽ 0.5 is orthorhombic and ferromagnetic at lower temperature, monoclinic and paramagnetic at higher temperature, and shows a first order magnetic-structural phase transition between the two. Magnetic moment versus magnetic field (MH) isotherms were measured just above the first order transition temperature for Gd5Si1.95Ge2.05 and Gd5Si2Ge2 samples and the field-induced coupled phase transition from paramagnetic/monoclinic to ferromagnetic/orthorhombic phase was observed. Using the method developed by Arrott [Phys. Rev. 108, 1394 (1957) ], the ferromagnetic portions of the MH isotherms were used to project the second order magnetic phase transition temperature of the orthorhombic phase, a region where the transition does not occur due to the first order transition at a lower temperature. These data points fall on the extrapolated line of the second order phase transition, drawn from the Si-rich region of the phase diagram.

Item Type:	Article
Date Type:	Publication
Status:	Published
Schools:	Engineering
Subjects:	T Technology > TA Engineering (General). Civil engineering (General)
Uncontrolled Keywords:	ferromagnetic-paramagnetic transitions, gadolinium compounds, magnetic moments, magnetocaloric effects, solid-state phase transformations
Publisher:	American Institute of Physics
ISSN:	1089-7550
Last Modified:	02 Jan 2018 21:12
URI:	http://orca-mwe.cf.ac.uk/id/eprint/5422

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