Order parameter symmetry in superconducting 2H-TaSeS.

IF 2.3 4区 物理与天体物理 Q3 PHYSICS, CONDENSED MATTER
K Yadav, M Lamba, M Singh, M Yadav, A Kumar, S Patnaik
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引用次数: 0

Abstract

Superconductors based on transition metal dichalcogenides are of substantial current relevance towards the material realization of topological superconductivity. Here, we report a detailed study on the synthesis and characterization of single crystals of 2H-TaSeS. A superconducting transition is confirmed at4.15Kthat coexists with a charge-density wave ordering at66K. The temperature dependence of the RF penetration depth indicates s-wave characteristics in the weak-coupling limit. Moderate electronic anisotropy is observed in the upper critical fields. DFT calculations confirm that the most stable structure belongs to theP63mcspace group. Negative values in the phonon dispersion curves verify the possibility of coexisting superconductivity with a charge-density wave in 2H-TaSeS. We also study vortex dynamics in this novel superconductor. Overall, our analysis suggests that 2H-TaSeS is a conventional Type-II superconductor without any evidence for topological superconductivity.

超导 2H-TaSeS 的阶次参数对称性
基于过渡金属二钴化物的超导体对拓扑超导的材料实现具有重要意义。在 4.15K 时,超导转变被证实与 66K 时的电荷密度波有序共存。射频穿透深度的温度依赖性表明了弱耦合极限下的s波特性。在上临界场中观察到适度的电子各向异性。DFT 计算证实,最稳定的结构属于 P63mc 空间群。 声子色散曲线中的负值验证了 2H-TaSeS 中电荷密度波与超导共存的可能性。我们还研究了这种新型超导体中的涡旋 动力学。总之,我们的分析表明,2H-TaSeS 是一种传统的II型超导体,没有任何拓扑 超导性的证据。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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来源期刊
Journal of Physics: Condensed Matter
Journal of Physics: Condensed Matter 物理-物理:凝聚态物理
CiteScore
5.30
自引率
7.40%
发文量
1288
审稿时长
2.1 months
期刊介绍: Journal of Physics: Condensed Matter covers the whole of condensed matter physics including soft condensed matter and nanostructures. Papers may report experimental, theoretical and simulation studies. Note that papers must contain fundamental condensed matter science: papers reporting methods of materials preparation or properties of materials without novel condensed matter content will not be accepted.
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