Unveiling the (De)coupling of magnetostructural transition nature in magnetocaloric R5Si2Ge2 (R = Tb, Gd) materials

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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]

subject category

Physics

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

our authors

foto João Cunha de Sequeira Amaral

João Cunha de Sequeira Amaral

Assistant Researcher
foto João Nuno Santos Gonçalves

João Nuno Santos Gonçalves

Junior Researcher
foto Vitor Brás Sequeira Amaral

Vitor Brás Sequeira Amaral

Full professor

Groups

G2 - Photonic, Electronic and Magnetic Materials

acknowledgements

Work partially supported by the projects FEDER/POCTI No. 155/94 and PTDC/CTM/NAN/115125/2009, from Fundacao para a Ciencia e a Tecnologia (FCT), Portugal. A.M.P. and J.S.A. thank FCT for the Grant Nos. SFRH/BPD/63150/2009 and SFRH/BPD/63942/2009. C.M. acknowledges the support of the Fundacin ARAID. The financial support of the Spanish MEC (MAT2008-06567-C02) and DGA (Grant No. E26) is acknowledged. Part of this was supported by EuroMagNET under the EU Contract No. 228043.

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Publication Details

type
Journal Article
year
2011
journal
APPLIED PHYSICS LETTERS
volume
99
article number
132510
publisher
AMER INST PHYSICS
issn
0003-6951
issue
13
digital object identifier
10.1063/1.3640213
web of science article identifier
WOS:000295618000050

Journal Metrics (JCR 2019)

Journal Impact Factor
3.597
Journal Impact Factor (5 yrs)
3.4
category normalized journal percentile
76.299

Citations

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