Abstract:
We studied the spectral functions of URu2Si2 in the hidden-order state by means of ultrahigh-resolution angle-resolved photoemission spectroscopy. High signal-to-noise ratio data uncover the existence of two anomalous fine structures, namely a “splitting” in the previously reported narrow dispersive band, and a small, dispersionless “satellite” structure. These structures can be explained by neither ordinary bands nor the development of a hybridization of two states; thus our observation should evoke the consideration of complicated many-body effects. As a possible origin, we suggest the existence of electron-mode coupling in the ordered state.
Citation:
Yoshida, R., Fukui, M., Haga, Y., Yamamoto, E., Onuki, Y., Okawa, M., ... & Yokoya, T. (2012). Observation of two fine structures related to the hidden order in the spectral functions of URu 2 Si 2. Physical Review B—Condensed Matter and Materials Physics, 85(24), 241102.