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

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

doi:10.1038/s41467-024-53737-w

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

Journal Article · Mon Dec 02 00:00:00 EST 2024 · Nature Communications

DOI:https://doi.org/10.1038/s41467-024-53737-w· OSTI ID:2585798

^[1]; ^[2]; ^[3]; ^[4]; ^[4]; ^[5]; ^[6]; ^[6]; ^[6]; ^[6]; ^[7]; Leandersson, Mats ^[7]; Polley, Craig ^[7]; ^[7]; ^[8]; ^[9]; ^[10]; ^[9]; Neupert, Titus ^[4]; ^[4]

SLAC National Accelerator Laboratory (SLAC), Menlo Park, CA (United States). Stanford Synchrotron Radiation Lightsource (SSRL); Univ. of Zurich (Switzerland)
Univ. of Wurzburg (Germany); National Research Council (CNR), Trieste (Italy)
Univ. of Zurich (Switzerland); Uppsala Univ. (Sweden)
Univ. of Zurich (Switzerland)
Renmin Univ. of China, Beijing (China)
Science and Technology Facilities Council (STFC), Oxford (United Kingdom). Diamond Light Source, Ltd.
Lund Univ. (Sweden). MAX IV Laboratory
Univ. of Bologna (Italy)
Univ. of Wurzburg (Germany)
Paul Scherrer Inst., Villigen (Switzerland). Center for Neutron and Muon Sciences

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 photo- emission spectroscopy, we provide comprehensive spectroscopic measure- ments 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. Simulta- neously, changes of both energy and mass of the VHS are observed. Combined, this reveals an anticorrelation between the unconventional CDW order para- meter 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 inter- plays under lattice variations.

View Accepted Manuscript (DOE)

Research Organization:: SLAC National Accelerator Laboratory (SLAC)

Sponsoring Organization:: National Key R&D Program of China; National Natural Science Foundation of China (NSFC); Swedish Research Council; Swiss National Science Foundation; USDOE Office of Science (SC)

Grant/Contract Number:: AC02-76SF00515

OSTI ID:: 2585798

Journal Information:: Nature Communications, Journal Name: Nature Communications Journal Issue: 1 Vol. 15; ISSN 2041-1723

Publisher:: Springer Science and Business Media LLCCopyright Statement

Country of Publication:: United States

Language:: English

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