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

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 A V 3 Sb 5 ( A = K, Rb, Cs) provide a testbed for electronic tunable states. In this study, through angle-resolved...

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Published in:Nature communications 2024-12, Vol.15 (1), p.10466-9
Main Authors: 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
Format: Article
Language:English
Subjects:
639/301/119/1003
639/766/119/995
Charge density waves
Charge materials
Compressive properties
Crystal structure
Energy
Fermions
Humanities and Social Sciences
Laboratories
Lattice strain
multidisciplinary
Order parameters
Photoelectric emission
Physics
Science
Science (multidisciplinary)
Singularities
Spectroscopy
Spectrum analysis
Superconductivity
Symmetry
Temperature
Tensile strain
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Summary: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 A V 3 Sb 5 ( 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 CsV 3 Sb 5 . 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. The authors report that tensile strain applied to CsV 3 Sb 5 strongly suppresses the charge-density-wave (CDW) gap, increases the mass of the fermions at the higher-order van Hove singularity (HO-VHS) and drives the energy of the HO-VHS towards the Fermi energy. Further, they suggest an important role of the HO-VHS in superconducting pairing.
ISSN:2041-1723
2041-1723
DOI:10.1038/s41467-024-53737-w