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

Chun Lin (), Armando Consiglio, Ola Kenji Forslund, Julia Küspert, 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 and Johan Chang
Additional contact information
Chun Lin: Universität Zürich
Armando Consiglio: Universität Würzburg
Ola Kenji Forslund: Universität Zürich
Julia Küspert: Universität Zürich
M. Michael Denner: Universität Zürich
Hechang Lei: Renmin University of China
Alex Louat: Harwell Science and Innovation Campus
Matthew D. Watson: Harwell Science and Innovation Campus
Timur K. Kim: Harwell Science and Innovation Campus
Cephise Cacho: Harwell Science and Innovation Campus
Dina Carbone: Lund University
Mats Leandersson: Lund University
Craig Polley: Lund University
Thiagarajan Balasubramanian: Lund University
Domenico Di Sante: University of Bologna
Ronny Thomale: Universität Würzburg
Zurab Guguchia: PSI Center for Neutron and Muon Sciences CNM
Giorgio Sangiovanni: Universität Würzburg
Titus Neupert: Universität Zürich
Johan Chang: Universität Zürich

Nature Communications, 2024, vol. 15, issue 1, 1-9

Abstract: 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 electronic tunable states. In this study, through angle-resolved photoemission spectroscopy, we provide comprehensive spectroscopic measurements of the electronic responses induced by compressive and tensile strains on the charge-density-wave (CDW) and van Hove singularity (VHS) in CsV3Sb5. We observe a tripling of the CDW gap magnitudes with ~ 1% strain. Simultaneously, changes of both energy and mass of the VHS are observed. Combined, this reveals an anticorrelation between the unconventional CDW order parameter and the mass of the VHS, and highlight the role of the latter in the superconducting pairing. The substantial electronic responses uncover a rich strain tunability of the versatile kagome system in studying quantum interplays under lattice variations.

Date: 2024
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DOI: 10.1038/s41467-024-53737-w

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