首页|钒基笼目AV3Sb5(A=K,Rb,Cs)体系的超导序参量及高压研究

钒基笼目AV3Sb5(A=K,Rb,Cs)体系的超导序参量及高压研究

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笼目晶格具有本征的几何阻挫,长期以来是研究量子磁性的重要平台.近年来,笼目晶格金属中的狄拉克费米子、平带、范霍夫奇点等能带结构及其调控受到了广泛关注.其中,钒基笼目AV3Sb5(A=K,Rb,Cs)体系具有非常规电荷密度波(CDW)及与其共存的超导,近期涌现了大量针对其物理性质和机制的研究工作.基于浙江大学关联物质研究中心在AV3Sb5体系中开展的一系列工作,本文对AV3Sb5中超导序参量对称性、超导与CDW的关系、超导的高压调控等方面的研究进行介绍.这些研究表明,无论CDW是否与超导共存,CsV3Sb5都保持无能隙节点的超导序参量,且超导能隙大小对压力或应力调控高度敏感.在静水压调控下,AV3Sb5中的CDW随着压力的增加被逐渐抑制,与超导的相互作用表现为竞争,没有CDW量子临界点的特征.在AV3Sb5中的CDW被压力抑制后,更高的压力下超导转变温度出现由结构相变驱动的非单调演化,形成高压下的超导圆顶.基于已有的研究,我们讨论AV3Sb5体系的共性以及待解决的科学问题.
The superconducting order parameter and high-pressure studies of the V-based kagome materials AV3Sb5(A=K,Rb,Cs)
The kagome lattice exhibits intrinsic geometric frustration and has been an important platform for studying quantum magnetism.Kagome metals have recently attracted significant attention due to the presence and tuning of Dirac Fermions,flat bands,and van Hove singularities.In particular,the vanadium-based kagome metals AV3Sb5(A=K,Rb,and Cs)host coexistent unconventional charge density waves(CDWs)and superconductivity(SC),stimulating a large amount of research into their physical properties and underlying mechanisms.This article reviews studies on the superconducting pairing symmetry,the interplay between SC and CDW,and high-pressure tuning of SC in AV3Sb5 compounds with a focus on work conducted at the Center for Correlated Matter at Zhejiang University.These studies show that CsV3Sb5 exhibits nodeless SC regardless of whether SC coexists with CDW and that the superconducting gap size is highly sensitive to pressure or strain.Under hydrostatic pressure,the CDW in A V3Sb5 is gradually suppressed with increasing pressure,clearly revealing a competition with SC without signatures of a CDW quantum critical point.After the CDW in AV3Sb5 is fully suppressed with pressure,a further increase in pressure leads to a nonmonotonic evolution of the superconducting transition temperature driven by structural modulations,resulting in a superconducting dome at high pressures.Based on these results,we discuss the commonalities of the AV3Sb5 system and the issues to be addressed.

kagome superconductorsuperconducting order parametercharge density wavestructural transitionpressure tuning

张栋庭、罗帅帅、段玮茵、宋宇、路欣、袁辉球

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浙江大学关联物质研究中心和物理学院,杭州 310058

笼目超导体 超导序参量 电荷密度波 结构相变 压力调控

国家重点研发计划浙江省重点研发计划浙江省尖兵领雁计划国家自然科学基金国家自然科学基金国家自然科学基金国家自然科学基金国家自然科学基金国家自然科学基金

2022YFA14022002021C010022022SDXHDX0005121743331197430611874137122743691203401712274363

2023

10.1360/SSPMA-2023-0297

中国科学(物理学 力学 天文学)
中国科学院

中国科学(物理学 力学 天文学)

CSTPCDCSCD北大核心
影响因子：0.644
ISSN：1674-7275
年,卷(期)：2023.53(12)
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