Influence of Domain Walls in the Incommensurate Charge Density Wave State of Cu Intercalated 1TTiSe2

Shichao Yan, Davide Iaia, Emilia Morosan, Eduardo Fradkin, Peter Abbamonte, and Vidya Madhavan
Phys. Rev. Lett. 118, 106405 – Published 10 March 2017
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Abstract

We report a low-temperature scanning tunneling microscopy study of the charge density wave (CDW) order in 1TTiSe2 and Cu0.08TiSe2. In pristine 1TTiSe2 we observe a long-range coherent commensurate CDW (CCDW) order. In contrast, Cu0.08TiSe2 displays an incommensurate CDW (ICDW) phase with localized CCDW domains separated by domain walls. Density of states measurements indicate that the domain walls host an extra population of fermions near the Fermi level which may play a role in the emergence of superconductivity in this system. Fourier transform scanning tunneling spectroscopy studies suggest that the dominant mechanism for CDW formation in the ICDW phase may be electron-phonon coupling.

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  • Received 26 September 2016

DOI:https://doi.org/10.1103/PhysRevLett.118.106405

© 2017 American Physical Society

Physics Subject Headings (PhySH)

Condensed Matter, Materials & Applied Physics

Authors & Affiliations

Shichao Yan1, Davide Iaia1, Emilia Morosan2, Eduardo Fradkin1, Peter Abbamonte1, and Vidya Madhavan1,*

  • 1Department of Physics and Frederick Seitz Materials Research Laboratory, University of Illinois Urbana-Champaign, Urbana, Illinois 61801, USA
  • 2Department of Physics and Astronomy, Rice University, Houston, Texas 77005, USA

  • *vm1@illinois.edu

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Vol. 118, Iss. 10 — 10 March 2017

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