Magnetic properties and low-temperature large magnetocaloric effect in the antiferromagnetic HoCu0.33Ge2 and ErCu0.25Ge2 compounds

被引：2

作者：

Gao, R. L. ^{[2
]}

Xu, Z. Y. ^{[1
,3
]}

Wang, L. C. ^{[4
]}

Dong, Q. Y. ^{[5
]}

Zhang, Y. ^{[5
]}

Liu, F. H. ^{[6
]}

Mo, Z. J. ^{[7
]}

Niu, E. ^{[4
]}

Fu, C. L. ^{[2
]}

Cai, W. ^{[2
]}

Chen, G. ^{[2
]}

Deng, X. L. ^{[2
]}

机构：

[1] Natl Inst Metrol, Beijing 100029, Peoples R China

[2] Chongqing Univ Sci & Technol, Sch Met & Mat Engn, Chongqing 401331, Peoples R China

[3] Natl Inst Metrol, Beijing 100029, Peoples R China

[4] Chinese Acad Sci, Inst Phys, State Key Lab Magnetism, Beijing 100190, Peoples R China

[5] Capital Normal Univ, Dept Phys, Beijing 100048, Peoples R China

[6] Natl Space Sci Ctr, Beijing 100190, Peoples R China

[7] Hebei Univ Technol, Sch Mat Sci & Engn, Tianjin 300401, Peoples R China

来源：

JOURNAL OF ALLOYS AND COMPOUNDS | 2015年 / 631卷

基金：

中国国家自然科学基金;

关键词：

HoCu0.33Ge2 and ErCu0.25Ge2; Antiferromagnetic; Metamagnetic transition; Magnetocaloric effect; Magnetic entropy changes; ENTROPY CHANGE; HO; REFRIGERATION; TRANSITION; TB; GD; DY;

D O I：

10.1016/j.jallcom.2015.01.073

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：

Magnetic properties and magnetocaloric effect (MCE) of HoCu0.33Ge2 and ErCu0.25Ge2 compounds have been investigated. The compounds were determined to be antiferromagnetic with the Neel temperatures T-N = 9 K and 3.9 K, respectively. The critical transition magnetic fields for the metamagnetic transition from antiferromagnetic to ferromagnetic state below T-N were determined to be 10 kOe for HoCu0.33Ge2 at 5 K and 6 kOe for ErCu0.25Ge2 at 2 K. Large MCE with the maximal values of magnetic entropy changes (Delta S-M) as -10.2 J/kg K at 10.5 K were found in HoCu0.33Ge2 for field changes of 0-70 kOe and -10.5 J/kg K at 5.5 K in ErCu0.25Ge2 for field changes of 0-50 kOe, respectively. The large Delta S-M around T-N as well as no hysteresis loss made RCuxGe2 competitive candidates as low temperature magnetic refrigerant. (C) 2015 Elsevier B.V. All rights reserved.

引用

页码：33 / 37

页数：5

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