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Emergence of charge density wave domain walls network in Pt doped TiSe2

ORAL

Abstract

Charge density wave (CDW) incommensuration in the TiSe2 family proceeds through the formation of domain walls (DWs). Previous scanning tunneling microscopy (STM) studies on Cu intercalated TiSe2 have shown that DWs host an extra population of electrons and might play an important role in the emergence of superconductivity. Here we report a low temperature STM study of Pt-doped TiSe2. A network of nanometer-thick DWs is observed and STM spectra reveal local inhomogeneity of the electronic properties which results in the emergence of pseudogaps of different size. In contrast to Cu intercalation, Pt substitution creates a network of 1D channels of low energy transport which subtract electrons from the bulk enhancing correlation effects. The interplay between electron correlation and disorder induced by DWs might be fundamental for the metal to insulator transition reported by previous transport measurements.

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Presenters

  • Davide Iaia

    University of Illinois at Urbana-Champaign

Authors

  • Davide Iaia

    University of Illinois at Urbana-Champaign

  • Kyungmin Lee

    Physics, The Ohio State University, Natl High Magnetic Field Lab

  • Jesse Choe

    Physics, Rice University

  • Junjing Zhao

    Physics, University of Virginia

  • Juqiang Li

    Physics, University of Virginia

  • Ming Shi

    Swiss Light Source, Paul Scherrer Institute, Swiss Light Source

  • Junzhang Ma

    Swiss Light Source, Paul Scherrer Institute

  • Mengyu Yao

    Swiss Light Source, Paul Scherrer Institute

  • Zhenyu Wang

    University of Illinois at Urbana-Champaign, UIUC, Department of Physics, University of Illinois at Urbana-Champaign, Department of Physics and Frederick Seitz Materials Research Laboratory, University of Illinois Urbana-Champaign

  • Masayuki Ochi

    Physics, Osaka University, Department of Physics, Osaka University, Osaka Univ, Osaka University

  • Ryotaro Arita

    Applied Physics, University of Tokyo, Department of Applied Physics, University of Tokyo, University of Tokyo,, RIKEN-CEMS, University of Tokyo

  • Utpal Chatterjee

    Physics, University of Virginia

  • Emilia Morosan

    Physics, Rice University, Department of Physics and Astronomy, Rice University, Rice Univ, Rice University

  • Vidya Madhavan

    Physics, University of Illinois at Urbana-Champaign, University of Illinois at Urbana-Champaign, Department of Physics, University of Illinois at Urbana-Champaign, Department of Physics and Frederick Seitz Materials Research Laboratory, University of Illinois Urbana-Champaign

  • Nandini Trivedi

    Department of Physics, Ohio State Univ - Columbus, Physics, The Ohio State University, The Ohio State University, Ohio State Univ Columbus, Ohio State University, Ohio State Univ - Columbus, Physics, Ohio State University