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Bibliographic Details
Main Authors:	Lin, Chun, Consiglio, Armando, Forslund, Ola Kenji, Kuspert, Julia, Denner, M. Michael, Lei, Hechang, Louat, Alex, Watson, Matthew D., Kim, Timur K., Cacho, Cephise, Carbone, Dina, Leandersson, Mats, Polley, Craig, Balasubramanian, Thiagarajan, Di Sante, Domenico, Thomale, Ronny, Guguchia, Zurab, Sangiovanni, Giorgio, Neupert, Titus, Chang, Johan
Format:	Preprint
Published:	2024
Subjects:	Materials Science Superconductivity
Online Access:	https://arxiv.org/abs/2402.16089
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Table of Contents:

Tunable quantum materials hold great potential for applications. Of special interest are materials in which small lattice strain induces giant electronic responses. The kagome compounds AV3Sb5 (A = K, Rb, Cs) provide a testbed for such singular electronic states. In this study, through angle-resolved photoemission spectroscopy, we provide comprehensive spectroscopic measurements of the giant responses induced by compressive and tensile strains on the charge-density-wave (CDW) order parameter and high-order van Hove singularity (HO-VHS) in CsV3Sb5. We observe a tripling of the CDW gap magnitudes with ~1% strain, accompanied by the changes of both energy and mass of the saddle-point fermions. Our results reveal an anticorrelation between the unconventional CDW order parameter and the mass of a HO-VHS, and highlight the role of the latter in the superconducting pairing. The giant electronic responses uncover a rich strain tunability of the versatile kagome system in studying quantum interplays under lattice perturbations.

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