TY - JOUR
T1 - Opening of a correlation-induced band gap in NiS
AU - Nakamura, M.
AU - Sekiyama, A.
AU - Namatame, H.
AU - Kino, H.
AU - Fujimori, A.
AU - Misu, A.
AU - Ikoma, H.
AU - Matoba, M.
AU - Anzai, S.
N1 - Copyright:
Copyright 2015 Elsevier B.V., All rights reserved.
PY - 1994
Y1 - 1994
N2 - 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.
AB - 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.
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U2 - 10.1103/PhysRevLett.73.2891
DO - 10.1103/PhysRevLett.73.2891
M3 - Article
AN - SCOPUS:0005059066
SN - 0031-9007
VL - 73
SP - 2891
EP - 2894
JO - Physical review letters
JF - Physical review letters
IS - 21
ER -