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

被引：11

作者：

Hadimani, R. L. ^{[1
]}

Melikhov, Y. ^{[1
]}

Snyder, J. E. ^{[1
]}

Jiles, D. C. ^{[1
]}

机构：

[1] Cardiff Univ, Wolfson Ctr Magnet, Cardiff CF24 3AA, S Glam, Wales

来源：

JOURNAL OF APPLIED PHYSICS | 2009年 / 105卷 / 07期

关键词：

D O I：

10.1063/1.3076419

中图分类号：

O59 [应用物理学];

学科分类号：

摘要：

Gd-5(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. (c) 2009 American Institute of Physics. [DOI: 10.1063/1.3076419]

引用

页数：3

共 11 条

[1] Scaling of the entropy change at the magnetoelastic transition in Gd5(SixGe1-x)4 -: art. no. 212402 [J].

Casanova, F ;

Batlle, X ;

Labarta, A ;

Marcos, J ;

Mañosa, L ;

Planes, A .

PHYSICAL REVIEW B, 2002, 66 (21) :1-4

[2] Magnetic refrigeration materials (invited) [J].

Gschneidner, KA ;

Pecharsky, VK .

JOURNAL OF APPLIED PHYSICS, 1999, 85 (08) :5365-5368

[3] Estimation of second order phase transition temperature of the orthorhombic phase of Gd5(SixGe1-x)4 using Arrott plots [J].

Hadimani, R. L. ;

Melikhov, Y. ;

Snyder, J. E. ;

Jiles, D. C. .

JOURNAL OF APPLIED PHYSICS, 2008, 103 (03)

[4]

HADIMANI RL, 2008, P INT C MAGN M UNPUB

[5] Angular dependence of the unusual first-order transition temperature in single-crystal Gd5(Si∼0.5Ge∼0.5)4 [J].

Han, M ;

Jiles, DC ;

Lee, SJ ;

Snyder, JE ;

Lograsso, TA ;

Schlagel, DL .

IEEE TRANSACTIONS ON MAGNETICS, 2003, 39 (05) :3151-3153

[6] Thermal expansion of single-crystal Gd5(Si1.95Ge2.05) showing unusual first-order transformation [J].

Han, M ;

Paulsen, JA ;

Snyder, JE ;

Jiles, DC ;

Lograsso, TA ;

Schlagel, DL .

IEEE TRANSACTIONS ON MAGNETICS, 2002, 38 (05) :3252-3254

[7] Hydrostatic pressure control of the magnetostructural phase transition in Gd5Si2Ge2 single crystals -: art. no. 024416 [J].

Magen, C ;

Morellon, L ;

Algarabel, PA ;

Ibarra, MR ;

Arnold, Z ;

Kamarad, J ;

Lograsso, TA ;

Schlagel, DL ;

Pecharsky, VK ;

Tsokol, AO ;

Gschneidner, KA .

PHYSICAL REVIEW B, 2005, 72 (02)

[8] Giant magnetoresistance near the magnetostructural transition in Gd5(Si1.8Ge2.2) [J].

Morellon, L ;

Stankiewicz, J ;

García-Landa, B ;

Algarabel, PA ;

Ibarra, MR .

APPLIED PHYSICS LETTERS, 1998, 73 (23) :3462-3464

[9] Magnetic-field-induced structural phase transition in Gd5(Si1.8Ge2.2) [J].

Morellon, L ;

Algarabel, PA ;

Ibarra, MR ;

Blasco, J ;

García-Landa, B ;

Arnold, Z ;

Albertini, F .

PHYSICAL REVIEW B, 1998, 58 (22) :R14721-R14724

[10] The giant magnetocaloric effect of optimally prepared Gd5Si2Ge2 [J].

Pecharsky, AO ;

Gschneidner, KA ;

Pecharsky, VK .

JOURNAL OF APPLIED PHYSICS, 2003, 93 (08) :4722-4728

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