TMU International Symposium on "New Quantum Phases Emerging from Novel Crystal Structure" | |
Magnetocaloric effect in a cluster-glass system Ho5Pd2?xNix | |
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 |
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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.
【 预 览 】
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Magnetocaloric effect in a cluster-glass system Ho5Pd2?xNix | 722KB | download |