Electrical Transport Properties of Incommensurate Layer Compounds (RES)xNbS2 (RE=Rare-Earth Metals; x=1.2, 0.6)
Electrical Transport Properties of Incommensurate Layer Compounds (RES)xNbS2 (RE=Rare-Earth Metals; x=1.2, 0.6)
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不相称层状化合物 (RES)xNbS2 的电传输特性（RE=稀土金属；x=1.2, 0.6）
DOI：
10.1143/jpsj.63.658
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发表时间：
1994
影响因子：
1.7
通讯作者：
N. Kojima
中科院分区：
文献类型：
--
作者：
T. Terashima;N. Kojima
无公度层状化合物(RES)xNbS2是一类新的NbS2插层化合物，x=1.2和x=0.6的化合物分别具有一级和二级结构。其中几个样品的电阻率和Seebeck系数的测量结果以及(LAS)1.2NbS2的Pauli顺磁化率的测量结果与刚性带模型很好地解释了，该模型考虑了从夹层Res层到宿主NbS2层的大量电荷转移。从结构不可公度性的角度讨论了化合物的大剩余电阻率。讨论了在∼20K以下观察到的第二阶段化合物的电阻率与载流子局域化的对数温度关系。在2∼-6K以下的大部分样品都观察到了分数超导电性，并提出了基于这种特殊结构的超导模型。
Incommensurate layer compounds (RES) x NbS 2 are a new class of the intercalation compounds of NbS 2 ; the x =1.2 and the x =0.6 compound have a stage-1 and a stage-2 structure, respectively. The results of the resistivity and the Seebeck coefficient measurements for several of them and the Pauli paramagnetic susceptibility of (LaS) 1.2 NbS 2 are well interpreted with the rigid-band model by incorporating a large charge transfer from the intercalate RES layer to the host NbS 2 layer. Large residual resistivities of the compounds are discussed in terms of the structural incommensurability. A logarithmic temperature dependence of the resistivity observed for the stage-2 compounds below ∼20 K is discussed in relation with the carrier localization. A fractional superconductivity has been observed for most of the samples below 2∼6 K and its model based on the peculiar structure is proposed.