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arXiv 1902.01772cond-mat.supr-con
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压缩H3S中超导性的分类

Classifying superconductivity in compressed H3S

E. F. Talantsev

摘要:

Drozdov及其同事在压缩H3 S中发现高温超导性(A. Drozdov等人例如,Nature 525,73(2015))预示着超导性的新时代。到目前为止,Tc = 260 K的记录转变温度与另一种富氢化合物LaH 10(M. Somayazulu等人例如,arXiv:1808.07695),其在P = 190 GPa的压力下变为超导。尽管对压缩到兆巴级压力的富氢化合物进行了非常深入的第一原理理论研究,但可用于此类材料的实验数据非常有限。本文分析了Mozaffari等人(S. Mozaffari等人例如,LA-UR-18-30460,DOI:10.2172/1481108)。结果表明,在所有考虑的情况下,超导能隙Δ(0)与费米能εF之比为0.03 < Δ(0)/εF < 0.07,Tc与费米温度TF之比为0.012 < Tc/TF < 0.039。这些表征H3 S作为非常规超导体,并将其放置在Tc与TF图中的相同趋势线上,所有非常规超导体都位于该趋势线上。

英文摘要:

The discovery of high-temperature superconductivity in compressed H3S by Drozdov and co-workers (A. Drozdov, et. al., Nature 525, 73 (2015)) heralded a new era in superconductivity. To date, the record transition temperature of Tc = 260 K stands with another hydrogen-rich compound, LaH10 (M. Somayazulu, et. al., arXiv:1808.07695) which becomes superconducting at pressure of P = 190 GPa. Despite very intensive first-principle theoretical studies of hydrogen-rich compounds compressed to megabar level pressure, there is a very limited experimental dataset available for such materials. In this paper, we analyze the upper critical field, Bc2(T), data of highly compressed H3S reported by Mozaffari and co-workers (S. Mozaffari, et. al., LA-UR-18-30460, DOI: 10.2172/1481108) by utilizing four different models of Bc2(T). In result, we find that the ratio of superconducting energy gap, Δ(0), to the Fermi energy, εF, in all considered scenarios is 0.03 < Δ(0)/εF < 0.07, with respective ratio of Tc to the Fermi temperature, TF, 0.012 < Tc/TF < 0.039. These characterize H3S as unconventional superconductor and places it on the same trend line in Tc versus TF plot, where all unconventional superconductors located.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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