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Fermi-surface instability at the 'hidden-order' transition of URu(2)Si(2)

Abstract : Solids with strong electron correlations generally develop exotic phases of electron matter at low temperatures(1-3). Among such systems, the heavy-fermion semimetal URu(2)Si(2) exhibits an enigmatic transition at T(0) = 17.5 K to a 'hidden-order' state for which the order parameter remains unknown after ;23 years of intense research(4,5). Various experiments point to the reconstruction and partial gapping of the Fermi surface when the hidden order establishes(6-14). However, up to now, the question of how this transition affects the electronic states at the Fermi surface has not been directly addressed by a spectroscopic probe. Here we show, using angle-resolved photoemission spectroscopy, that a band of heavy quasiparticles drops below the Fermi level on the transition to the hidden-order state. Our data provide the first direct evidence of a large reorganization of the electronic structure across the Fermi surface of URu(2)Si(2) occurring during this transition, and unveil a new kind of Fermi-surface instability in correlated electron systems.
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Contributor : Christine Hadrossek <>
Submitted on : Friday, March 9, 2012 - 2:25:07 PM
Last modification on : Wednesday, December 9, 2020 - 3:12:44 PM

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A. F. Santander-Syro, M. Klein, F. L. Boariu, A. Nuber, P. Lejay, et al.. Fermi-surface instability at the 'hidden-order' transition of URu(2)Si(2). Nature Physics, Nature Publishing Group, 2009, 5, pp.637-641. ⟨10.1038/NPHYS1361⟩. ⟨in2p3-00677748⟩



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