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arXiv 2005.07315cond-mat.supr-concond-mat.mtrl-scicond-mat.str-el
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FeSe-based材料中的奇异超导态

Exotic Superconducting States in FeSe-based Materials

Takasada Shibauchi, Tetsuo Hanaguri, Yuji Matsuda

摘要:

高温超导性和FeSe基材料中发现的各种奇异超导态在过去十年中一直处于凝聚态物理研究的前沿。多带电子结构、强烈的轨道依赖现象、极小的费米能、电子向列性和拓扑学等方面的独特性质产生了许多独特而迷人的超导态。在这里,我们提供了一个概述,我们目前的理解{ \it散装} FeSe基材料的超导性,专注于FeSe和等价取代的FeSe $_{1-x}$ S $_{x}$和FeSe $_{1-x}$ Te $_{x}$。我们讨论了FeSe的高度非平凡的超导性质,包括极端的各向异性配对态,从BCS到玻色-爱因斯坦凝聚(BEC)态的交叉现象,一种新的场诱导超导相,以及时间反转对称性破缺。我们还讨论了硫和碲掺杂的超导能隙函数的演化,特别注意量子临界涨落和拓扑超导电性的影响。FeSe基材料为研究各种奇异的超导态提供了一个很好的平台。

英文摘要:

High-temperature superconductivity and a wide variety of exotic superconducting states discovered in FeSe-based materials have been at the frontier of research on condensed matter physics over the past decade. Unique properties originating from the multiband electronic structure, strongly orbital-dependent phenomena, extremely small Fermi energy, electronic nematicity, and topological aspects give rise to many distinct and fascinating superconducting states. Here, we provide an overview of our current understanding of the superconductivity of {\it bulk} FeSe-based materials, focusing on FeSe and the isovalent substituted FeSe$_{1-x}$S$_{x}$ and FeSe$_{1-x}$Te$_{x}$. We discuss the highly nontrivial superconducting properties in FeSe, including extremely anisotropic pairing states, crossover phenomena from Bardeen--Cooper--Schrieffer (BCS) to Bose--Einstein condensation (BEC) states, a novel field-induced superconducting phase, and broken time-reversal symmetry. We also discuss the evolution of the superconducting gap function with sulfur and tellurium doping, paying particular attention to the impact of quantum critical nematic fluctuations and the topological superconductivity. FeSe-based materials provide an excellent playground to study various exotic superconducting states.

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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