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Nature Physics 5 (2009) 637-641
Fermi-surface instability at the 'hidden-order' transition of URu(2)Si(2)
A. F. Santander-Syro1, 2, 3, M. Klein, F. L. Boariu, A. Nuber, P. Lejay, F. Reinert
(2009)

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.
1 :  LPEM - Laboratoire de Physique et d'Etude des Matériaux
2 :  LPS - Laboratoire de Physique des Solides
3 :  CSNSM - Centre de Spectrométrie Nucléaire et de Spectrométrie de Masse
Physique/Matière Condensée/Electrons fortement corrélés
ELECTRON SUPERCONDUCTOR URU2SI2 – PHOTOEMISSION-SPECTROSCOPY – SYSTEM URU2SI2 – HEAVY – STATE – RESISTIVITY – SYMMETRY
Lien vers le texte intégral : 
http://fr.arXiv.org/abs/0903.3755