Interplay of Nanoscale Strain and Smectic Susceptibility in Kagome Superconductors

IF 15.7 1区 物理与天体物理 Q1 PHYSICS, MULTIDISCIPLINARY
Yidi Wang, Hong Li, Siyu Cheng, He Zhao, Brenden R. Ortiz, Andrea Capa Salinas, Stephen D. Wilson, Ziqiang Wang, Ilija Zeljkovic
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Abstract

Exotic quantum solids can host electronic states that spontaneously break rotational symmetry of the electronic structure, such as electronic nematic phases and unidirectional charge density waves (CDWs). When electrons couple to the lattice, uniaxial strain can be used to anchor and control this electronic directionality. Here, we reveal an unusual impact of strain on unidirectional “smectic” CDW orders in kagome superconductors AV3Sb5 using spectroscopic-imaging scanning tunneling microscopy. We discover local decoupling between the smectic electronic director axis and the direction of anisotropic strain. While the two can generally be aligned along the same direction in regions of a small CDW gap, the tendency for alignment decreases in regions where the CDW gap is the largest. This feature, in turn, suggests nanoscale variations in smectic susceptibility, which we attribute to a combination of local strain and electron correlation strength. Overall, we observe an unusually high decoupling rate between the smectic electronic director of the three-state Potts order and anisotropic strain, revealing weak smectoelastic coupling in the CDW phase of kagome superconductors. This finding is phenomenologically different from the extensively studied nematoelastic coupling in the Ising nematic phase of Ising nematic phase of Fe-based superconductor bulk single crystals, providing a contrasting picture of how strain can control electronic unidirectionality in different families of quantum materials. Published by the American Physical Society 2025
Kagome超导体中纳米应变与晶微磁化率的相互作用
奇异量子固体可以承载自发破坏电子结构旋转对称性的电子态,如电子向列相和单向电荷密度波(CDWs)。当电子与晶格耦合时,可以使用单轴应变来锚定和控制这种电子方向性。在这里,我们利用光谱成像扫描隧道显微镜揭示了应变对kagome超导体AV3Sb5中单向“近晶”CDW顺序的不寻常影响。我们发现了近晶电子指向轴与各向异性应变方向之间的局部解耦。在CDW间隙较小的区域,两者通常可以沿同一方向排列,但在CDW间隙最大的区域,排列趋势减弱。这一特征反过来又表明了纳米尺度上的近晶磁化率变化,我们将其归因于局部应变和电子相关强度的结合。总的来说,我们观察到三态Potts阶的近晶电子指示子与各向异性应变之间存在异常高的去耦率,揭示了kagome超导体CDW相中弱的近晶弹性耦合。这一发现在现象学上不同于广泛研究的铁基超导体块状单晶的伊辛向列相的伊辛向列相中的线弹性耦合,提供了应变如何控制不同家族量子材料中的电子单向性的对比图片。2025年由美国物理学会出版
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来源期刊
Physical Review X
Physical Review X PHYSICS, MULTIDISCIPLINARY-
CiteScore
24.60
自引率
1.60%
发文量
197
审稿时长
3 months
期刊介绍: Physical Review X (PRX) stands as an exclusively online, fully open-access journal, emphasizing innovation, quality, and enduring impact in the scientific content it disseminates. Devoted to showcasing a curated selection of papers from pure, applied, and interdisciplinary physics, PRX aims to feature work with the potential to shape current and future research while leaving a lasting and profound impact in their respective fields. Encompassing the entire spectrum of physics subject areas, PRX places a special focus on groundbreaking interdisciplinary research with broad-reaching influence.
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