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Observation of two fine structures related to the hidden order in the spectral functions of URu$$_2$$Si$$_2$$

Yoshida, Rikiya*; Fukui, Masaki*; Haga, Yoshinori  ; Yamamoto, Etsuji  ; Onuki, Yoshichika; Okawa, Mario*; Malaeb, W.*; Shin, S.*; Muraoka, Yuji*; Yokoya, Takayoshi*

The spectral functions of URu$$_2$$Si$$_2$$ in the hidden-order state are studied by means of ultrahigh-resolution angle-resolved photoemission spectroscopy. High signal-to-noise ratio data uncover the existence of two anomalous fine structures. The structures can be explained by neither ordinary bands nor the development of a hybridization of two states. As a possible origin, we suggest the existence of electron-mode coupling in the ordered state.

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Category:Materials Science, Multidisciplinary

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