Magnetocaloric effect in a cluster-glass system Ho5Pd2?xNix

TMU International Symposium on "New Quantum Phases Emerging from Novel Crystal Structure"

Toyoizumi, Saori^1 ; Kitazawa, Hideaki^2 ; Morita, Kengo^3 ; Tamaki, Akira^1

Graduate School of Advanced Science and Technology, Tokyo Denki University, 5 Senju Asahi-cho, Adachi, Tokyo

120-8551, Japan^1

National Institute for Materials Science, 1-2-1 Sengen, Ibaraki, Tsukuba

305-0047, Japan^2

School of Engineering, Tokyo Denki University, 5 Senju Asahi-cho, Adachiku, Tokyo

120-8551, Japan^3

关键词: Cluster glass;    Effect of chemicals;    Indirect exchange interactions;    Magnetic entropy change;    Rare earth intermetallic compounds;    Relative cooling power;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/683/1/012036/pdf
DOI  :  10.1088/1742-6596/683/1/012036

来源: IOP

【 摘 要 】

In order to investigate the effect of chemical pressure on the large magnetocaloric effect in Ho5Pd2, we conducted X-ray diffraction, magnetization, and specific heat measurements on Ho5Pd2-xNix(0≤ x ≤ 1.0) rare-earth intermetallic compounds. The linear x dependence of the lattice constant a suggests that Ni is replaced with Pd in the case of Ho5Pd2-xNix(0 ≤ x ≤ 0.5). The spin-glass transition temperature Tgand paramagnetic Curie temperature θPindicate a weak oscillatory x dependence. However, the magnetic entropy change - ΔSmand the relative cooling power (RCP) are rapidly suppressed with increasing x. These large reductions in - ΔSmand RCP cannot be explained only in terms of normal Ruderman-Kittel- Kasuya-Yoshida (RKKY)-type indirect exchange interactions.