Signature of hidden order and evidence for periodicity modification in URuSi

URuSiの隠れた秩序の証拠と周期性の変化

吉田 力矢*; 中村 祥明*; 福井 仁紀*; 芳賀 芳範   ; 山本 悦嗣  ; 大貫 惇睦; 大川 万里生*; Shin, S.*; 平井 正明*; 村岡 祐治*; 横谷 尚睦*

Yoshida, Rikiya*; Nakamura, Yoshiaki*; Fukui, Masaki*; Haga, Yoshinori; Yamamoto, Etsuji; Onuki, Yoshichika; Okawa, Mario*; Shin, S.*; Hirai, Masaaki*; Muraoka, Yuji*; Yokoya, Takayoshi*

The detail of electronic structures near the Fermi level in URuSi has been investigated employing state-of-art laser angle-resolved photoemission spectroscopy. The observation of a narrow dispersive band near the Fermi level in the ordered state as well as its absence in RH-substituted sample strongly suggest that the emergence of the narrow band is a clear signature of the hidden-order transition.