Ambient pressure colossal magnetocaloric effect tuned by composition in Mn1-xFexAs

被引：201
作者：
De Campos, Ariana
Rocco, Daniel L.
Carvalho, Alexandre Magnus G.
Caron, Luana
Coelho, Adelino A.
Gama, Sergio
Da Silva, Luzeli M.
Gandra, Flavio C. G.
Dos Santos, Adenilson O.
Cardoso, Lisandro P.
Von Ranke, Pedro J.
De Oliveira, Nilson A.
机构：
[1] Univ Estadual Campinas, UNICAMP, Inst Fis Gleb Wataghin, BR-13083970 Campinas, SP, Brazil
[2] Univ Estado Rio De Janeiro, Inst Fis, BR-20550013 Rio De Janeiro, Brazil
来源：
NATURE MATERIALS | 2006年 / 5卷 / 10期
关键词：
Crystal structure - Extraction - Lattice constants - Magnetoelectric effects - Nickel compounds - Superconducting transition temperature;
D O I：
10.1038/nmat1732
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 magnetocaloric effect (MCE) is the basis for magnetic refrigeration, and can replace conventional gas compression technology due to its superior efficiency and environment friendliness(1-3). MCE materials must exhibit a large temperature variation in response to an adiabatic magnetic-field variation and a large isothermal entropic effect is also expected. In this respect, MnAs shows the colossal MCE, but the effect appears under high pressures(4). In this work, we report on the properties of Mn1-xFexAs that exhibit the colossal effect at ambient pressure. The MCE peak varies from 285K to 310K depending on the Fe concentration. Although a large thermal hysteresis is observed, the colossal effect at ambient pressure brings layered magnetic regenerators with huge refrigerating power closer to practical applications around room temperature.
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页码：802 / 804
页数：3
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