Coexistence of localized and (induced) itinerant magnetism and heat-capacity anomalies in Gd{sub 1{minus}x}Y{sub x}Ni alloys
Coexistence of localized and (induced) itinerant magnetism and heat-capacity anomalies in Gd{sub 1{minus}x}Y{sub x}Ni alloys
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Gd{sub 1{minus}x}Y{sub x}Ni 合金中局部和（感应）流动磁性与热容异常的共存
DOI：
10.1103/physrevb.55.8369
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发表时间：
1997
影响因子：
3.7
通讯作者：
V. Nagarajan
中科院分区：
文献类型：
--
作者：
R. Mallik;P. Paulose;E. Sampathkumaran;S. Patil;V. Nagarajan
报告了合金 Gd{sub 1{minus}x}Y{sub x}Ni 的磁化强度 (M)、电阻率 ({rho}) 和热容 (C) 测量结果。 X射线衍射图表明，随着x在x=0.4附近增加，晶体结构从CrB型向FeB型斜方结构发生变化。 GdNi 已知在 70 K 时会出现铁磁性有序，观察到的 T{sub C} 和 {theta}{sub p} 的 x 依赖性证明，FeB 结构中 Gd-Gd 交换相互作用的强度增强了约 1.5 倍。 M 数据表明富 Gd 合金存在过量力矩。观察到的磁化行为作为证据表明，局域磁性（来自 Gd）和感应型巡回铁磁性（可能来自 Ni 3d 带）共存。在很宽的温度范围内，随着温度降低到 T{sub C} 以上，C 会增加，这可能是由于这些合金中的短程有序效应。 {版权} {ital 1997} {ital 美国物理学会}
The results of magnetization (M), electrical resistivity ({rho}), and heat-capacity (C) measurements for the alloys, Gd{sub 1{minus}x}Y{sub x}Ni, are reported. The x-ray-diffraction patterns indicate that there is a change in the crystal structure from CrB-type to FeB-type orthorhombic structure for increasing x near x=0.4. GdNi has been known to order ferromagnetically at 70 K and the observed x dependence of T{sub C} and {theta}{sub p} proves that the strength of Gd-Gd exchange interaction is enhanced by a factor of about 1.5 in the FeB structure. The M data suggest that there is an excess moment for the Gd-rich alloys. The observed magnetization behavior is taken as an evidence to show that there is coexistence of localized magnetism (from Gd) and itinerant ferromagnetism of induced-type, presumably from Ni 3d band. There is an enhancement of C with decreasing temperature above T{sub C} over a wide temperature range presumably due to short-range order effects in these alloys. {copyright} {ital 1997} {ital The American Physical Society}