Large reversible magnetocaloric effect in the ferromagnetic pyrochlores R2Mn2O7 (R = Dy, Ho, Yb)

被引：6
|
作者：
Cui, Q. [1 ,2 ,3 ]
Wang, N. N. [1 ,2 ,3 ]
Su, N. [1 ,2 ,3 ]
Cai, Y. Q. [1 ,2 ]
Wang, B. S. [1 ,2 ,3 ,4 ]
Shinmei, T. [5 ]
Irifune, T. [5 ]
Alonso, Jose A. [6 ]
Cheng, J. G. [1 ,2 ,3 ,4 ]
机构：
[1] Chinese Acad Sci, Beijing Natl Lab Condensed Matter Phys, Beijing 100190, Peoples R China
[2] Chinese Acad Sci, Inst Phys, Beijing 100190, Peoples R China
[3] Univ Chinese Acad Sci, Sch Phys Sci, Beijing 100190, Peoples R China
[4] Songshan Lake Mat Lab, Dongguan 523808, Guangdong, Peoples R China
[5] Ehime Univ, Geodynam Res Ctr, Matsuyama, Ehime 7908577, Japan
[6] CSIC, Inst Ciencia Mat Madrid, E-28049 Madrid, Spain
来源：
JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS | 2019年 / 490卷
基金：
国家重点研发计划; 中国国家自然科学基金;
关键词：
R2Mn2O7 pyrochlore oxides; Magnetocaloric effect; Ferromagnetic order; METAMAGNETIC TRANSITION; MAGNETIC-PROPERTIES; HEAT-CAPACITY; SYSTEM;
D O I：
10.1016/j.jmmm.2019.165494
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
We report the large reversible magnetocaloric effect (MCE) in the cubic pyrochlores R2Mn2O7 (R = Dy, Ho, Yb) near their second-order ferromagnetic (FM) transition at T-c approximate to 39 K due to a simultaneous FM ordering of rear-earth R3+ and transition-metal Mn4+ localized moments. Under the magnetic field change of 1T (7T), the maximum magnetic entropy change -Delta S-M(max) is 5.7 (20.1), 4.3 (18.4), 3.9 (13.9) J.kg(-1) K-1, and the estimated magnetic refrigerant capacity RC reaches 20.0 (564), 18.4 (503.7), 13.1 (371.4) J.kg(-1) for Dy2Mn2O7, Ho2Mn2O7, and Yb2Mn2O7, respectively. We have discussed their magnetic properties and its correlation with MCE in terms of the intrinsic single-ion anisotropy of R(3+ )ions. Our results demonstrate that R2Mn2O7 cubic pyrochlores constitute a promising material platform for magnetic refrigeration applications in the intermediate temperature range.
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页数：6
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