Pseudogap of charge-density-wave compound SmNiC2 studied by high-resolution photoemission spectroscopy

Takafumi Sato, Seigo Soma, Kosuke Nakayama, Takashi Takahashi, Susumu Shimomura, Hideya Onodera

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11 Citations (Scopus)

Abstract

We have performed high-resolution photoemission spectroscopy of a rare-earth inter-metallic compound SmNiC2 which undergoes a charge-density-wave (CDW) transition at TCDW = 148K and a ferromagnetic transition at TC = 17:5 K. We have determined the valence-band and near-EF (Fermi level) electronic states, and observed a marked suppression of the spectral density of states (DOS) within 60 - 70 meV with respect to EF below TCDW, indicative of a partial gap (pseudogap) opening due to the CDW formation. Finite DOS at E F in the CDW state suggests an imperfect nature of the Fermi-surface nesting.

Original languageEnglish
Article number044707
Journaljournal of the physical society of japan
Volume79
Issue number4
DOIs
Publication statusPublished - 2010 Apr 1

Keywords

  • Charge density wave
  • Electronic structure
  • Inter-metallic compound

ASJC Scopus subject areas

  • Physics and Astronomy(all)

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