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  • Letter
  • Open Access

Thermal transport signatures of the excitonic transition and associated phonon softening in the layered chalcogenide Ta2NiSe5

Yuan-Shan Zhang1, Jan A. N. Bruin1,*, Yosuke Matsumoto1, Masahiko Isobe1, and Hidenori Takagi1,2,3,†

  • 1Max Planck Institute for Solid State Research, 70569 Stuttgart, Germany
  • 2Institute for Functional Matter and Quantum Technologies, University of Stuttgart, 70569 Stuttgart, Germany
  • 3Department of Physics, University of Tokyo, 113-0033 Tokyo, Japan

  • *j.bruin@fkf.mpg.de
  • †h.takagi@fkf.mpg.de
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Phys. Rev. B 104, L121201 – Published 17 September, 2021

DOI: https://doi.org/10.1103/PhysRevB.104.L121201

Abstract

The quasi-one-dimensional layered compound Ta2NiSe5 has been proposed to undergo a transition to an excitonic insulator at Tc=326 K. We found a clear anomaly at Tc in the in-plane thermal conductivities both parallel (∥a) and perpendicular (∥c) to the one-dimensional chains, κa and κc. While κa shows a rapid decrease below Tc, κc shows a pronounced V-shaped suppression centered at Tc. We argue that the decrease of κa represents the suppression of the quasiparticle contribution below Tc due to the excitonic transition. On the other hand, the V-shaped suppression of κc comes from the enhanced phonon scattering by soft phonons associated with the monoclinic transition with momentum q∥c. The continued suppression of κc up to an extremely high temperature above Tc suggests the persistence of phonon softening likely coupled to electronic, presumably excitonic, fluctuations.

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Phys. Rev. B 104, L121201– Published 17 September, 2021
  • Received 25 March 2021
  • Revised 4 September 2021
  • Accepted 8 September 2021
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Published by the American Physical Society under the terms of the Creative Commons Attribution 4.0 International license. Further distribution of this work must maintain attribution to the author(s) and the published article's title, journal citation, and DOI. Open access publication funded by the Max Planck Society.

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