Interlayer-spacing dependence of Tc in LixMyHfNCl (M: molecule) superconductors.
Interlayer-spacing dependence of Tc in LixMyHfNCl (M: molecule) superconductors.
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DOI：
10.1103/physrevlett.100.247005
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发表时间：
2008-06
影响因子：
8.6
通讯作者：
T. Takano;T. Kishiume;Y. Taguchi;Y. Iwasa
中科院分区：
文献类型：
--
作者：
T. Takano;T. Kishiume;Y. Taguchi;Y. Iwasa
我们系统地研究了Li{x}M{y}HfNCl（M：分子）的全局相图，证明了载流子密度x和层间距d的独立可控性。在LixHfNCl中，T{c}几乎恒定为20 K的超导相占主导地位，时间范围为0.15<or<or.50。伴随着共插时 d 的增加，观察到 T{c} 增强高达 30%，同时保留了 x 独立性。该结果表明配对相互作用强烈依赖于费米表面沿 k{z} 方向的翘曲，这意味着电荷和/或自旋涨落的相关性。
We have systematically investigated the global phase diagram for Li{x}M{y}HfNCl (M: molecule), demonstrating the independent controllability of carrier density x and interlayer spacing d. In LixHfNCl, the superconducting phase with almost constant T{c} of 20 K prevails for 0.15<or<or.50. Accompanied by an increase in d upon the cointercalation, an enhancement of T{c} up to 30% was observed with its x independence preserved. This result indicates that pairing interaction strongly depends on the Fermi surface warping along the k{z} direction, implying the relevance of charge and/or spin fluctuation.