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

被引：18

作者：

Pereira, A. M. ^{[1
,2
]}

Kampert, E. ^{[3
]}

Moreira, J. M. ^{[1
,2
]}

Zeitler, U. ^{[3
]}

Belo, J. H. ^{[1
,2
]}

Magen, C. ^{[4
]}

Algarabel, P. A. ^{[5
,6
]}

Morellon, L. ^{[5
,6
,7
]}

Ibarra, M. R. ^{[5
,6
,7
]}

Goncalves, J. N. ^{[8
,9
]}

Amaral, J. S. ^{[8
,9
]}

Amaral, V. S. ^{[8
,9
]}

Sousa, J. B. ^{[1
,2
]}

Araujo, J. P. ^{[1
,2
]}

机构：

[1] Univ Porto, IFIMUP, P-4169007 Oporto, Portugal

[2] Univ Porto, IN Inst Nanosci & Nanotechnol, Dept Fis & Astron, Fac Ciencias, P-4169007 Oporto, Portugal

[3] Radboud Univ Nijmegen, High Field Magnet Lab, NL-6525 ED Nijmegen, Netherlands

[4] Univ Zaragoza, Inst Nanociencia Aragon ARAID, E-50009 Zaragoza, Spain

[5] Univ Zaragoza, Inst Ciencia Mat Aragon, E-50009 Zaragoza, Spain

[6] CSIC, Zaragoza 50009, Spain

[7] Univ Zaragoza, Inst Nanociencia Aragon, E-50009 Zaragoza, Spain

[8] Univ Aveiro, Dept Fis, P-3810193 Aveiro, Portugal

[9] Univ Aveiro, CICECO, P-3810193 Aveiro, Portugal

来源：

APPLIED PHYSICS LETTERS | 2011年 / 99卷 / 13期

关键词：

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;

D O I：

10.1063/1.3640213

中图分类号：

O59 [应用物理学];

学科分类号：

摘要：

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]

引用

页数：3

共 18 条

[1] CRITERION FOR FERROMAGNETISM FROM OBSERVATIONS OF MAGNETIC ISOTHERMS [J].