Temperature dependence of the electrical resistivity and thermopower of U2Ni2In and Nd2Ni2Sn
Temperature dependence of the electrical resistivity and thermopower of U2Ni2In and Nd2Ni2Sn
复制标题
U2Ni2In 和 Nd2Ni2Sn 的电阻率和热电势与温度的关系
DOI：
10.1063/1.361998
复制
发表时间：
1996
影响因子：
3.2
通讯作者：
J. Etourneau
中科院分区：
文献类型：
--
作者：
R. P. Pinto;M. Amado;M. Braga;J. B. Sousa;B. Chevalier;D. Laffargue;J. Etourneau
在4~250K温度范围内，准确测量了U2Ni2In和Nd2Ni2Sn三元化合物的电阻率(ρ，dρ/dt)和温差电势(S，ds/dt)，并与U2Ni2Sn中的结果进行了比较。U2Ni2In/U2Ni2Sn对使我们能够研究p电子性质(以及与In/Sn元素有关的其他能带效应)对输运性质的影响，而Nd2Ni2SnU2Ni2Sn对提供了关于4f/5f电子所起作用的直接信息。所有这些化合物最初都处于反铁磁态，在Tn的dρ/dt有一个特征极小值。在U2Ni2In化合物中，在略低于TN的ρ(T)中观察到急剧的还原，这表明当T≤为0.8TN时，反铁磁态与相干的近藤效应共存。在Nd2Ni2Sn中，我们在Tn以下观察到两个不同的相变，这两个相变具有一级性质，可能与有序-有序磁性相变有关。ρ(T)在…中的反常行为
Accurate measurements of the electrical resistivity (ρ,dρ/dT) and of the thermoelectric power (S,dS/dT) were performed in the ternary compounds U2Ni2In and Nd2Ni2Sn from 4 K to 250 K, and the results are compared with those previously obtained in U2Ni2Sn. The pair U2Ni2In/U2Ni2Sn enables us to study the influence of the p‐electron character (and other band effects related to the elements In/Sn) on the transport properties, whereas the pair Nd2Ni2Sn/U2Ni2Sn provides direct information on the role played by the 4f/5f electrons. All these compounds order initially in the antiferromagnetic state, exhibiting a characteristic minimum in dρ/dT at TN. In the U2Ni2In compound a drastic reduction is observed in ρ(T) slightly below TN, suggesting the coexistence of the antiferromagnetic state with a coherent Kondo effect when T≤0.8 TN. In Nd2Ni2Sn we observe two distinct phase transitions below TN, of first‐order character and likely associated with order‐order magnetic transitions. The anomalous behavior of ρ(T) in...