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

M. Mulazzi, A. Chainani, N. Katayama, Ritsuko Eguchi, M. Matsunami, H. Ohashi, Y. Senba, Minoru Nohara, M. Uchida, H. Takagi, S. Shin

Research output: Contribution to journalArticle

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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 - Aug 18 2010
Externally publishedYes

Fingerprint

Charge density waves
Photoelectron spectroscopy
Vanadium
photoelectron spectroscopy
Fermi level
Dispersions
photoelectric emission
X rays
Electron correlations
Core levels
Fermi surface
Electrons
vanadium
Photoemission
Absorption spectroscopy
Sulfur
Band structure
Electronic structure
Transition metals
Condensation

ASJC Scopus subject areas

  • Condensed Matter Physics
  • Electronic, Optical and Magnetic Materials

Cite this

Absence of nesting in the charge-density-wave system 1 T-VS2 as seen by photoelectron spectroscopy. / Mulazzi, M.; Chainani, A.; Katayama, N.; Eguchi, Ritsuko; Matsunami, M.; Ohashi, H.; Senba, Y.; Nohara, Minoru; Uchida, M.; Takagi, H.; Shin, S.

In: Physical Review B - Condensed Matter and Materials Physics, Vol. 82, No. 7, 075130, 18.08.2010.

Research output: Contribution to journalArticle

Mulazzi, M. ; Chainani, A. ; Katayama, N. ; Eguchi, Ritsuko ; Matsunami, M. ; Ohashi, H. ; Senba, Y. ; Nohara, Minoru ; Uchida, M. ; Takagi, H. ; Shin, S. / Absence of nesting in the charge-density-wave system 1 T-VS2 as seen by photoelectron spectroscopy. In: Physical Review B - Condensed Matter and Materials Physics. 2010 ; Vol. 82, No. 7.
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AU - Matsunami, M.

AU - Ohashi, H.

AU - Senba, Y.

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AU - Takagi, H.

AU - Shin, S.

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