The transport properties of RCo<sub>2</sub>compounds
作者:E Gratz、R Resel、A T Burkov、E Bauer、A S Markosyan、A Galatanu
DOI:10.1088/0953-8984/7/33/008
日期:1995.8.14
The transportproperties of intermetallic compounds RCo2 (R=Pr, Nd, Sm, Gd-Lu, Sc and Y) in the temperature range from 4.2 up to 1000 K were studied and different contributions were determined. In the non-magnetic compounds the spin fluctuation contribution to the electrical resistivity, rho sf varies as (T/Tsf)2, and thermal resistivity, Wsf varies as (T/Tsf), were found to follow the theoretical
研究了金属间化合物 RCo2(R = Pr、Nd、Sm、Gd-Lu、Sc 和 Y)在 4.2 至 1000 K 的温度范围内的传输特性,并确定了不同的贡献。在非磁性化合物中,自旋波动对电阻率的贡献,rho sf 随 (T / Tsf) 2 变化,而热阻率 Wsf 随 (T / Tsf) 变化,符合理论预测。推导了由传导电子在 4f 矩上散射引起的自旋无序贡献,并发现它与 de Gennes 因子成正比。结果表明,自旋涨落是温度相关热电势低温特性的原因,而高温行为主要由状态密度函数决定。在居里温度附近的顺磁区,
Evidence of Spontaneous Co Moment in a Rare-Earth–Cobalt Laves Phase Compound:<sup>59</sup>Co NMR Study of LaCo<sub>2</sub>
作者:Hiroyuki Nakamura、Akihito Nakahara、Masayuki Shiga、A. V. Tsvyashchenko、L. N. Fomicheva
DOI:10.1143/jpsj.71.2117
日期:2002.9.15
cubic Lavesphasecompound LaCo 2 was investigated by 59 Co NMR experiments. At low temperatures, we found two kinds of NMR signals corresponding to small internal fields, -2.8 and 0.1 T, which are separated due to the anisotropy in the hyperfine field. This result reveals the weak ferromagnetism in LaCo 2 , indicating that a small spontaneous Co moment can exist in rare-earth–cobalt Lavesphase compounds
通过 59 Co NMR 实验研究了高压合成的立方 Laves 相化合物 LaCo 2 的基态磁性。在低温下,我们发现了两种对应于小内场的 NMR 信号,-2.8 和 0.1 T,由于超精细场的各向异性,它们被分开。该结果揭示了 LaCo 2 的弱铁磁性,表明在稀土-钴 Laves 相化合物中可以存在小的自发 Co 矩,既没有来自稀土原子的分子交换场,也没有无序的影响。有序矩和易磁化轴估计分别为 <0.1 µ B /Co 和 [111]。