Unveiling the (De)coupling of magnetostructural transition nature in magnetocaloric R5Si2Ge2 (R = Tb, Gd) materials
authors Pereira, AM; Kampert, E; Moreira, JM; Zeitler, U; Belo, JH; Magen, C; Algarabel, PA; Morellon, L; Ibarra, MR; Goncalves, JN; Amaral, JS; Amaral, VS; Sousa, JB; Araujo, JP
nationality International
author keywords ferromagnetic materials; ferromagnetic-paramagnetic transitions; free energy; gadolinium compounds; magnetic transition temperature; magnetisation; magnetocaloric effects; paramagnetic materials; silicon compounds; solid-state phase transformations; terbium compounds
abstract We present a detailed study on the magnetization under high magnetic fields of Tb5Si2Ge2 and Gd5Si2Ge2 compounds. From the Arrott plot construction (A. Arrott, Phys. Rev. 108, 1394 (1957)), we were able to estimate the T-C of each structure (M and O(I)) experimentally and found that the T-C of the O(I) phase can be directly obtained by extrapolating the T-C curve of this phase in the respective phase diagram. Using a physical model based on free energy considerations, one explains the (de) coupling of the magnetic and structural transitions in R-5(SixGe1-x)(4) (R = Tb, Gd) compounds. (C) 2011 American Institute of Physics. [doi: 10.1063/1.3640213]
issn 0003-6951
year published 2011
volume 99
issue 13
digital object identifier (doi) 10.1063/1.3640213
web of science category Physics, Applied
subject category Physics
unique article identifier WOS:000295618000050
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