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arXiv 0808.2653cond-mat.supr-con
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Fe-Sb基材料可能的超导电性:LiFeSb的密度泛函研究

Possible Superconductivity in Fe-Sb Based Materials: Density Functional Study of LiFeSb

Lijun Zhang, Alaska Subedi, D. J. Singh, Mao-Hua Du

摘要:

我们调查的电子和其他性质的假设化合物LiFeSb超导LiFeAs和FeSe使用密度泛函计算。结果表明,LiFeAs结构中的LiFeSb在没有不稳定声子模的意义上是动态稳定的,并且具有与层状铁基超导体非常相似的电子和磁性。重要的是,发现了与As化合物非常相似的费米面结构和自旋密度波,这些结果表明,如果通过掺杂或其它方法抑制自旋密度波,可能存在类似于Fe-As基化合物的超导电性。展望了这种材料的合成在纯形式或在固溶体与FeTe。

英文摘要:

We investigate the electronic and other properties of the hypothetical compound LiFeSb in relation to superconducting LiFeAs and FeSe using density functional calculations. The results show that LiFeSb in the LiFeAs structure would be dynamically stable in the sense of having no unstable phonon modes, and would have very similar electronic and magnetic properties to the layered Fe based superconductors. Importantly, a very similar structure for the Fermi surface and a spin density wave related to but stronger than that in the corresponding As compound is found. These results are indicative of possible superconductivity analogous to the Fe-As based compounds if the spin density wave can be suppressed by doping or other means. Prospects for synthesizing this material in pure form or in solid solution with FeTe are discussed.

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