F. L. Boariu, C. Bareille, H. Schwab, A. Nuber, P. Lejay, T. Durakiewicz, F. Reinert, A. F. Santander-Syro
We study, using high-resolution angle-resolved photoemission spectroscopy, the evolution of the electronic structure in URu2Si2 at the Gamma, Z and X high-symmetry points, from the high-temperature Kondo-screened regime to the low-temperature 'hidden-order' (HO) state. At all temperatures and symmetry points, we find structures resulting from the hybridization between heavy and light bands, related to the Kondo lattice formation. Strikingly, we find that while the HO induces pronounced changes at Gamma and Z, the electronic structure at X does not change. This explicitly demonstrates that the hidden-order parameter is anisotropic. Furthermore, our data show that the interaction of a light electron band with the Kondo-lattice characterizing the paramagnetic state leads to additional, momentum-dependent gaping in the ordered state. In particular, in the HO state, we observe the opening of a gap in momentum at the Gamma and Z points.
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http://arxiv.org/abs/1211.6144
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