Hydrostatic pressure-induced modifications of structural transitions lead to large enhancements of magnetocaloric effects in MnNiSi-based systems

被引：113

作者：

Samanta, Tapas ^{[1
]}

Lepkowski, Daniel L. ^{[1
]}

Saleheen, Ahmad Us ^{[1
]}

Shankar, Alok ^{[1
]}

Prestigiacomo, Joseph ^{[1
]}

Dubenko, Igor ^{[2
]}

Quetz, Abdiel ^{[2
]}

Oswald, Iain W. H. ^{[3
]}

McCandless, Gregory T. ^{[3
]}

Chan, Julia Y. ^{[3
]}

Adams, Philip W. ^{[1
]}

Young, David P. ^{[1
]}

Ali, Naushad ^{[2
]}

Stadler, Shane ^{[1
]}

机构：

[1] Louisiana State Univ, Dept Phys & Astron, Baton Rouge, LA 70803 USA

[2] So Illinois Univ, Dept Phys, Carbondale, IL 62901 USA

[3] Univ Texas Dallas, Dept Chem, Richardson, TX 75080 USA

来源：

PHYSICAL REVIEW B | 2015年 / 91卷 / 02期

基金：

美国国家科学基金会;

关键词：

MAGNETOSTRUCTURAL TRANSITION; MARTENSITIC-TRANSFORMATION; GIANT;

D O I：

10.1103/PhysRevB.91.020401

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

A remarkable decrease of the structural transition temperature of MnNiSi from 1200 to < 300 K by chemically alloying it with MnFeGe results in a coupling of the magnetic and structural transitions, leading to a large magnetocaloric effect near room temperature. Application of relatively low hydrostatic pressures (similar to 2.4 kbar) lead to an extraordinary enhancement of the isothermal entropy change from -Delta S = 44 to 89 J/kgK at ambient and 2.4 kbar applied pressures, respectively, for a field change of Delta B = 5 T, and is associated with a large relative volume change of about 7% with P = 2.4 kbar.

引用

页数：5

共 23 条

[1] PRESSURE AND TEMPERATURE-DEPENDENCE OF ELECTRICAL-RESISTIVITY OF PB AND SN FROM 1-300-5 AND 0-10 GPA-USE AS CONTINUOUS RESISTIVE PRESSURE MONITOR ACCURATE OVER WIDE TEMPERATURE-RANGE - SUPERCONDUCTIVITY UNDER PRESSURE IN PB, SN, AND IN [J].