Wave-vector-dependent electron-phonon coupling and the charge-density-wave transition in TbTe3

M. Maschek, S. Rosenkranz, R. Heid, A. H. Said, P. Giraldo-Gallo, I. R. Fisher, and F. Weber
Phys. Rev. B 91, 235146 – Published 29 June 2015

Abstract

We present a high-energy-resolution inelastic x-ray scattering investigation of the soft phonon mode in the charge-density-wave (CDW) system TbTe3. We analyze our data based on lattice dynamical calculations using density-functional-perturbation theory and find clear evidence that strongly momentum-dependent electron-phonon coupling defines the periodicity of the CDW superstructure: Our experiment reveals strong phonon softening and increased phonon linewidths over a large part in reciprocal space adjacent to the CDW ordering vector qCDW=(0,0,0.3). Further, qCDW is clearly offset from the wave vector of (weak) Fermi surface nesting qFS=(0,0,0.25), and our detailed analysis indicates that electron-phonon coupling is responsible for this shift. Hence, we can add TbTe3, which was previously considered as a canonical CDW compound following the Peierls scenario, to the list of distinct charge-density-wave materials characterized by momentum-dependent electron-phonon coupling.

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  • Received 5 November 2014
  • Revised 10 June 2015

DOI:https://doi.org/10.1103/PhysRevB.91.235146

©2015 American Physical Society

Authors & Affiliations

M. Maschek1, S. Rosenkranz2, R. Heid1, A. H. Said3, P. Giraldo-Gallo4,6, I. R. Fisher5,6, and F. Weber1

  • 1Karlsruhe Institute of Technology, Institute of Solid State Physics, 76021 Karlsruhe, Germany
  • 2Materials Science Division, Argonne National Laboratory, Argonne, Illinois 60439, USA
  • 3Advanced Photon Source, Argonne National Laboratory, Argonne, Illinois 60439, USA
  • 4Geballe Laboratory for Advanced Physics and Department of Physics, Stanford University, Stanford, California 94305, USA
  • 5Geballe Laboratory for Advanced Physics and Department of Applied Physics, Stanford University, Stanford, California 94305, USA
  • 6The Stanford Institute for Materials and Energy Sciences, SLAC National Accelerator Laboratory, Menlo Park, California 94025, USA

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Issue

Vol. 91, Iss. 23 — 15 June 2015

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