Direct measurements of inverse magnetocaloric effects in metamagnetic shape-memory alloy NiCoMnIn

被引：154

作者：

Kihara, T. ^{[1
]}

Xu, X. ^{[2
]}

Ito, W. ^{[3
]}

Kainuma, R. ^{[2
]}

Tokunaga, M. ^{[1
]}

机构：

[1] Univ Tokyo, Inst Solid State Phys, Kashiwa, Chiba 2778581, Japan

[2] Tohoku Univ, Dept Mat Sci, Sendai, Miyagi 9808579, Japan

[3] Sendai Natl Coll Technol, Natori, Miyagi 9811239, Japan

来源：

PHYSICAL REVIEW B | 2014年 / 90卷 / 21期

关键词：

TRANSITION; TRANSFORMATION;

D O I：

10.1103/PhysRevB.90.214409

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

To clarify the electronic, lattice, and magnetic contribution to the inverse magnetocaloric effect (IMCE) in the metamagnetic shape-memory alloy Ni45Co5Mn50-xInx, magnetization, magnetocaloric effect, and specific-heat measurements were carried out in a wide range of fields and temperatures. The IMCEs of Ni45Co5Mn36.7In13.3 were directly measured as adiabatic temperature changes in pulsed fields of up to 15 T. A maximum temperature decrease of -12.8 K was observed. The low-temperature specific heats in both the austenitic and the martensitic phases of Ni45Co5Mn36.5In13.5 were measured by using steady fields. Through analyses of the data, the entropy changes in charge (1.2 J/kg K), spin (-29 J/kg K), and lattice (51 J/kg K) sectors were individually evaluated. The result demonstrates the dominant role of the lattice sector in inverse MCEs in this material.

引用

页数：6

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