Observation of a griffiths-like phase in the magnetocaloric compound Tb5Si2Ge2

被引：206

作者：

Magen, C ^{[1
]}

Algarabel, PA

Morellon, L

Araújo, JP

Ritter, C

Ibarra, MR

Pereira, AM

Sousa, JB

机构：

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

[2] CSIC, E-50009 Zaragoza, Spain

[3] Inst Max Von Laue Paul Langevin, F-38042 Grenoble 9, France

[4] Univ Porto, FCUP, IFIMUP, P-4169007 Oporto, Portugal

[5] Univ Porto, FCUP, Dept Phys, P-4169007 Oporto, Portugal

来源：

PHYSICAL REVIEW LETTERS | 2006年 / 96卷 / 16期

关键词：

D O I：

10.1103/PhysRevLett.96.167201

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

The onset of a Griffiths-like phase has been observed in Tb5Si2Ge2 (T-C=110 K) by means of magnetic susceptibility and small-angle neutron scattering experiments. We show the growth of a ferromagnetic cluster system characterized by an inverse susceptibility exponent lower than unity at T-C < T < T-G approximate to 200 K. We suggest that the Griffiths-like state is originated by local disorder within the crystallographic structure, stabilized and enhanced by competing intralayer and interlayer magnetic interactions. Both factors thus promote segregation of nanometric regions with ferromagnetic interactions.

引用

页数：4

共 28 条

[21] 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

[22] Giant magnetocaloric effect in Gd-5(Si2Ge2) [J].

Pecharsky, VK ;

Gschneidner, KA .

PHYSICAL REVIEW LETTERS, 1997, 78 (23) :4494-4497

[23] Tunable magnetic regenerator alloys with a giant magnetocaloric effect for magnetic refrigeration from similar to 20 to similar to 290 K [J].

Pecharsky, VK ;

Gschneidner, KA .

APPLIED PHYSICS LETTERS, 1997, 70 (24) :3299-3301

[24]

Pecharsky VK, 2001, ADV MATER, V13, P683, DOI 10.1002/1521-4095(200105)13:9<683::AID-ADMA683>3.0.CO

[25]

2-O

[26]

Radeira M., 1985, PHYS REV LETT, V54, P1321

[27] Magnetic and structural phase diagram of Tb5(SixGe1-x)4 -: art. no. 094405 [J].

Ritter, C ;

Morellon, L ;

Algarabel, PA ;

Magen, C ;

Ibarra, MR .

PHYSICAL REVIEW B, 2002, 65 (09) :1-10

[28] Colossal magnetoresistance is a Griffiths singularity [J].

Salamon, MB ;

Lin, P ;

Chun, SH .

PHYSICAL REVIEW LETTERS, 2002, 88 (19) :1972031-1972034

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