TY - JOUR
T1 - Pseudogap of charge-density-wave compound SmNiC2 studied by high-resolution photoemission spectroscopy
AU - Sato, Takafumi
AU - Souma, Seigo
AU - Nakayama, Kosuke
AU - Takahashi, Takashi
AU - Shimomura, Susumu
AU - Onodera, Hideya
PY - 2010/4
Y1 - 2010/4
N2 - 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.
AB - 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.
KW - Charge density wave
KW - Electronic structure
KW - Inter-metallic compound
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U2 - 10.1143/JPSJ.79.044707
DO - 10.1143/JPSJ.79.044707
M3 - Article
AN - SCOPUS:77951479181
SN - 0031-9015
VL - 79
JO - Journal of the Physical Society of Japan
JF - Journal of the Physical Society of Japan
IS - 4
M1 - 044707
ER -