Photoemission spectroscopy of spinel-type CuV 2S 4 single crystal

Hironari Okada, Keiichi Koyama, Masashi Nakatake, Kenya Shimada, Hirofumi Namatame, Masaki Taniguchi, Kazuo Watanabe

Research output: Contribution to journalArticle

4 Citations (Scopus)

Abstract

We have performed photoemission spectroscopy studies of single-crystalline CUV 2S 4 using synchrotron radiation, in order to clarify the electronic structure changes across the charge density wave (CDW) transitions in a spinel type compound. Photo-energy-dependent studies show a peak structure just below the Fermi level (E F), which undergoes resonant enhancement at an excitation energy hv = 54.5 eV. This energy corresponds to the V 3p-3d threshold energy, thus suggesting that the density of states (DOS) at E F is mainly composed of V 3d states. From temperature-dependent measurements, we observe a reduction in spectral DOS at and near E F, leading to the formation of a pseudogap across CDW transition temperatures. The pseudogap energy scale of ̃0.05 eV, identified at the top of the valence band, is significantly larger than the value expected from a BCS-like transition.

Original languageEnglish
Article number114711
Journaljournal of the physical society of japan
Volume77
Issue number11
DOIs
Publication statusPublished - 2008 Nov 1

Keywords

  • Charge density wave
  • CuV S
  • Photoemission spectroscopy
  • Spinel

ASJC Scopus subject areas

  • Physics and Astronomy(all)

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    Okada, H., Koyama, K., Nakatake, M., Shimada, K., Namatame, H., Taniguchi, M., & Watanabe, K. (2008). Photoemission spectroscopy of spinel-type CuV 2S 4 single crystal. journal of the physical society of japan, 77(11), [114711]. https://doi.org/10.1143/JPSJ.77.114711