Opening of a correlation-induced band gap in NiS

M. Nakamura, A. Sekiyama, H. Namatame, H. Kino, A. Fujimori, A. Misu, H. Ikoma, Masanori Matoba, S. Anzai

Research output: Contribution to journalArticle

30 Citations (Scopus)

Abstract

We have measured high-resolution photoemission spectra of NiS, which undergoes a nonmetal-metal transition at Tt260 K. Below Tt, a small band gap opens; the band edge is essentially a step function broadened only by 15 meV. This observation is difficult to reconcile with one-electron band theory, which predicts a much broader band edge, implying a dramatic influence of electron correlation on quasiparticle excitations and on the opening of a band gap in 3D antiferromagnetic insulators.

Original languageEnglish
Pages (from-to)2891-2894
Number of pages4
JournalPhysical Review Letters
Volume73
Issue number21
DOIs
Publication statusPublished - 1994

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step functions
electrons
photoelectric emission
transition metals
insulators
broadband
high resolution
excitation

ASJC Scopus subject areas

  • Physics and Astronomy(all)

Cite this

Nakamura, M., Sekiyama, A., Namatame, H., Kino, H., Fujimori, A., Misu, A., ... Anzai, S. (1994). Opening of a correlation-induced band gap in NiS. Physical Review Letters, 73(21), 2891-2894. https://doi.org/10.1103/PhysRevLett.73.2891

Opening of a correlation-induced band gap in NiS. / Nakamura, M.; Sekiyama, A.; Namatame, H.; Kino, H.; Fujimori, A.; Misu, A.; Ikoma, H.; Matoba, Masanori; Anzai, S.

In: Physical Review Letters, Vol. 73, No. 21, 1994, p. 2891-2894.

Research output: Contribution to journalArticle

Nakamura, M, Sekiyama, A, Namatame, H, Kino, H, Fujimori, A, Misu, A, Ikoma, H, Matoba, M & Anzai, S 1994, 'Opening of a correlation-induced band gap in NiS', Physical Review Letters, vol. 73, no. 21, pp. 2891-2894. https://doi.org/10.1103/PhysRevLett.73.2891
Nakamura M, Sekiyama A, Namatame H, Kino H, Fujimori A, Misu A et al. Opening of a correlation-induced band gap in NiS. Physical Review Letters. 1994;73(21):2891-2894. https://doi.org/10.1103/PhysRevLett.73.2891
Nakamura, M. ; Sekiyama, A. ; Namatame, H. ; Kino, H. ; Fujimori, A. ; Misu, A. ; Ikoma, H. ; Matoba, Masanori ; Anzai, S. / Opening of a correlation-induced band gap in NiS. In: Physical Review Letters. 1994 ; Vol. 73, No. 21. pp. 2891-2894.
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