Spin-glass behaviour with extended short-range ferromagnetic order in U2RhSi3

被引:61
作者
Li, DX
Dönni, A
Kimura, Y
Shiokawa, Y
Homma, Y
Haga, Y
Yamamoto, E
Honma, T
Onuki, Y
机构
[1] Niigata Univ, Dept Phys, Niigata 9502181, Japan
[2] Tohoku Univ, Inst Mat Res, Oarai Branch, Oarai, Ibaraki 3111313, Japan
[3] Japan Atom Energy Res Inst, Adv Sci Res Ctr, Tokai, Ibaraki 3191195, Japan
[4] Osaka Univ, Dept Phys, Grad Sch Sci, Toyonaka, Osaka 5600043, Japan
关键词
D O I
10.1088/0953-8984/11/42/307
中图分类号
O469 [凝聚态物理学];
学科分类号
070205 ;
摘要
For U2RhSi3, which crystallizes in a disordered derivative of the hexagonal AlB2-type structure, we present a detailed investigation of magnetic properties by measurements of AC and DC susceptibility, magnetization, magnetic relaxation, specific heat and electrical resistivity. The results provide evidence for the formation of extended short-range ferromagnetic order at the temperature T-C approximate to 25 K, as indicated by a specific heat anomaly, and for a low-temperature spin-glass state with a freezing temperature T-f = 19.6 K. According to systematic specific heat experiments on isostructural spin-glass systems, short-range ferromagnetic correlations above the spin-freezing temperature are observed in U2RhSi3 (T-C approximate to 25 K, T-f = 19.6 K) and U2CoSi3 (T-C approximate to 10 K, T-f approximate to 8 K), but not in U2PdSi3 (T-f = 13.5 K) and U2NiSi3 (T-f approximate to 22 K). Different degrees of structural disorder of transition metal and silicon atoms, both on the same crystallographic site, seem to be the origin for the distinct different magnetic behaviour.
引用
收藏
页码:8263 / 8274
页数:12
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