Optical study of RbV3Sb5: Multiple density-wave gaps and phonon anomalies

M. Wenzel, B. R. Ortiz, S. D. Wilson, M. Dressel, A. A. Tsirlin, and E. Uykur
Phys. Rev. B 105, 245123 – Published 16 June 2022

Abstract

Temperature-dependent reflectivity studies on the nonmagnetic kagome metal RbV3Sb5 in a broad energy range (5020000cm1, equivalent to 6 meV–2.5 eV) down to 10 K are reported. Below TCDW=102 K, the optical spectra demonstrate a prominent spectral-weight transfer from low to higher energies as the fingerprint of the charge-density-wave (CDW) formation with the opening of a partial gap. A detailed analysis reveals two energy scales of respectively 800 cm1 (100 meV) and 360cm1 (45 meV), the latter visible below 50 K only. Additionally, two modes at respectively 160cm1 (20 meV) and 430cm1 (53 meV) can be traced both above and below TCDW. They show strong anomalies already above TCDW with a further renormalization across the transition, suggesting the importance of the electron-phonon coupling in RbV3Sb5 in both normal and CDW states. While the 160cm1 mode can be attributed to the E1u phonon, the 430cm1 mode could not be reproduced in our phonon calculations. The antiresonance nature of this mode suggests a nontrivial electron-phonon coupling in RbV3Sb5. A distinct localization peak observed at all temperatures signals damped electron dynamics, whereas the reduced Drude spectral weight manifests moderate deviations from the band picture in RbV3Sb5.

  • Figure
  • Figure
  • Figure
  • Figure
  • Figure
  • Figure
  • Figure
5 More
  • Received 14 December 2021
  • Revised 5 February 2022
  • Accepted 2 June 2022

DOI:https://doi.org/10.1103/PhysRevB.105.245123

©2022 American Physical Society

Physics Subject Headings (PhySH)

Condensed Matter, Materials & Applied Physics

Authors & Affiliations

M. Wenzel1, B. R. Ortiz2,3, S. D. Wilson3, M. Dressel1, A. A. Tsirlin4,5,*, and E. Uykur1,6,†

  • 11. Physikalisches Institut, Universität Stuttgart, D-70569 Stuttgart, Germany
  • 2Materials Department and California Nanosystems Institute, University of California Santa Barbara, Santa Barbara, California 93106, USA
  • 3Materials Department, University of California Santa Barbara, Santa Barbara, California 93106, USA
  • 4Experimental Physics VI, Center for Electronic Correlations and Magnetism, University of Augsburg, D-86159 Augsburg, Germany
  • 5Felix Bloch Institute for Solid-State Physics, Leipzig University, D-04103 Leipzig, Germany
  • 6Helmholtz Zentrum Dresden Rossendorf, Institute of Ion Beam Physics and Materials Research, D-01328 Dresden, Germany

  • *altsirlin@gmail.com
  • ece.uykur@pi1.physik.uni-stuttgart.de

Article Text (Subscription Required)

Click to Expand

References (Subscription Required)

Click to Expand
Issue

Vol. 105, Iss. 24 — 15 June 2022

Reuse & Permissions
Access Options
Author publication services for translation and copyediting assistance advertisement

Authorization Required


×
×

Images

×

Sign up to receive regular email alerts from Physical Review B

Log In

Cancel
×

Search


Article Lookup

Paste a citation or DOI

Enter a citation
×