Absence of nesting in the charge-density-wave system 1 T-VS2 as seen by photoelectron spectroscopy

M. Mulazzi, Ashish Atma Chainani, N. Katayama, R. Eguchi, M. Matsunami, H. Ohashi, Y. Senba, M. Nohara, M. Uchida, H. Takagi, S. Shin

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Abstract

We report on the electronic structure and Fermi surfaces of the transition-metal dichalcogenide 1 T-VS2 in the low-temperature charge-density-wave (CDW) ordered phase. Using soft x-ray angle-resolved photoemission spectroscopy (ARPES), we investigate the in-plane and out-of-plane vanadium- and sulfur-derived band dispersions and identify kz dispersions in this layered system. Core-level photoemission and x-ray absorption spectroscopy show that vanadium electrons are in the d1 configuration while 2p-3d resonant ARPES shows only 3d -derived dispersive bands near the Fermi level. Comparison of energy- and angle-dependent data with band-structure calculations reveals renormalization of the 3d bands, but no lower Hubbard band, a signature of the rather weak electron-electron correlations in VS2. High-resolution temperature-dependent low-energy ARPES measurements show the opening of an energy gap at the Fermi level that is attributed to the condensation of the CDW phase. The results indicate a CDW transition in the absence of nesting for 1 T-VS2

Original languageEnglish
Article number075130
JournalPhysical Review B - Condensed Matter and Materials Physics
Volume82
Issue number7
DOIs
Publication statusPublished - 2010 Aug 18

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

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