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

被引：8

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：

中国国家自然科学基金; 国家重点研发计划;

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.

引用

页数：6

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