Opening of a correlation-induced band gap in NiS

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

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31 Citations (Scopus)


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
Issue number21
Publication statusPublished - 1994

ASJC Scopus subject areas

  • Physics and Astronomy(all)


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