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arXiv · 2402.16089

Uniaxial strain tuning of charge modulation and singularity in a kagome superconductor

Chun Lin·Armando Consiglio·Ola Kenji Forslund·Julia Kuspert·M. Michael Denner·Hechang Lei·Alex Louat·Matthew D. Watson·Timur K. Kim·Cephise Cacho·Dina Carbone·Mats Leandersson·Craig Polley·Thiagarajan Balasubramanian·Domenico Di Sante·Ronny Thomale·Zurab Guguchia·Giorgio Sangiovanni·Titus Neupert·Johan Chang
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Abstract

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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Chun Lin, Armando Consiglio, Ola Kenji Forslund, Julia Kuspert, M. Michael Denner, Hechang Lei, Alex Louat, Matthew D. Watson, Timur K. Kim, Cephise Cacho, Dina Carbone, Mats Leandersson, Craig Polley, Thiagarajan Balasubramanian, Domenico Di Sante, Ronny Thomale, Zurab Guguchia, Giorgio Sangiovanni, Titus Neupert, Johan Chang. 2024-02-25. Uniaxial strain tuning of charge modulation and singularity in a kagome superconductor. https://doi.org/10.1038/s41467-024-53737-w

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