Magneto-thermal and magneto-transport behavior around the martensitic transition in Ni50-xCoxMn40Sb10 (x=9, 9.5) Heusler alloys

被引：15

作者：

Nayak, Ajaya K. ^{[1
]}

Rao, N. V. Rama ^{[1
,2
]}

Suresh, K. G. ^{[1
]}

Nigam, A. K. ^{[3
]}

机构：

[1] Indian Inst Technol, Dept Phys, Magnet Mat Lab, Bombay 400076, Maharashtra, India

[2] Def Met Res Lab, Hyderabad 500058, Andhra Pradesh, India

[3] Tata Inst Fundamental Res, Bombay 400005, Maharashtra, India

来源：

JOURNAL OF ALLOYS AND COMPOUNDS | 2010年 / 499卷 / 02期

关键词：

Heusler alloy; Magnetocaloric effect; Magnetoresistance; Martensitic transition; INDUCED SHAPE RECOVERY;

D O I：

10.1016/j.jallcom.2010.03.190

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

The structural, magnetic, magnetocaloric and magnetoresistance behavior in Ni50-xCoxMn40Sb10 (x = 9 and 9.5) has been studied around the magnetostructural transition. The X-ray diffraction results at room temperature show that the compound with x = 9 is predominantly martensitic whereas the one with x = 9.5 is austenite in nature. The maximum magnetic entropy change of 9.2 J kg(-1) K-1 was achieved in x = 9.5 at 246 K in a field of 50 kOe and a value of 8.2J kg(-1) K-1 was found near room temperature for x = 9. The effective refrigeration capacity of 106 J/kg has been calculated for x=9, which is larger than the same observed in other Ni-Mn based Heusler alloy systems. A large magnetoresistance of 25% was obtained around room temperature for x=9. The large difference in the magnetization between the martensitic and austenite phases is responsible for the large magnetocaloric effect and magnetoresistance in these compounds. (C) 2010 Elsevier B.V. All rights reserved.

引用

页码：140 / 143

页数：4

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