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Field induced structural phase transition at temperatures above the Curie point in Gd5(SixGe1-x)4

Hadimani, R. L., Melikhov, Yevgen, Snyder, John Evan and Jiles, David 2009. Field induced structural phase transition at temperatures above the Curie point in Gd5(SixGe1-x)4. Journal of Applied Physics 105 (7) , 07A927 - 07A927. 10.1063/1.3076419

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Abstract

Gd5(SixGe1−x)4 exhibits a field induced first order phase transition from a monoclinic paramagnetic to an orthorhombic ferromagnetic at temperatures above its Curie temperature for 0.41 ≤ x ≤ 0.51. The field required to induce the transition increases with temperature. This field induced first order phase transition was observed even above the projected second order phase transition temperature of the orthorhombic phase. This may be due to the fact that the applied magnetic field is so high that it causes the broadening to a wider range of higher temperatures of the second order phase transition of the orthorhombic phase, and at such high magnetic fields the magnetic moment is still quite large, therefore, causing the transition. This hypothesis seems to be confirmed by the various magnetic moment versus magnetic field, magnetic moment versus temperature, and strain versus magnetic field measurements carried out on single crystal Gd5Si1.95Ge2.05 and Gd5Si2Ge2 samples at magnetic fields of 0–9 T and at temperatures of 265–305 K.

Item Type: Article
Status: Published
Schools: Engineering
Subjects: Q Science > QC Physics
Uncontrolled Keywords: Curie temperature; ferromagnetic materials; gadolinium alloys; germanium alloys; magnetic moments; magnetic transitions; silicon alloys
Publisher: American Institute of Physics
ISSN: 0021-8979
Last Modified: 02 Jun 2019 23:02
URI: http://orca-mwe.cf.ac.uk/id/eprint/7773

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