Volume 85, Number 2, January 2009
Article Number 27003
Number of page(s) 6
Section Condensed Matter: Electronic Structure, Electrical, Magnetic and Optical Properties
Published online 26 January 2009
EPL, 85 (2009) 27003
DOI: 10.1209/0295-5075/85/27003

On the destruction of the hidden order in URu2Si2 by a strong magnetic field

J. Levallois1, K. Behnia2, J. Flouquet3, P. Lejay4 and C. Proust1

1   Laboratoire National des Champs Magnétiques Pulsés (UMR 5147 CNRS-UPS-INSA) - Toulouse, France, EU
2   Laboratoire Photons et Matière (UPR5-CNRS), ESPCI - 10 Rue de Vauquelin, 75231 Paris, France, EU
3   Institut Nanosciences et Cryogénie, SPSMS/MDN, CEA-Grenoble - 38054 Grenoble, France, EU
4   Institut Néel, CNRS/UJF, B.P. 166, 38 042 Grenoble Cedex 9, France, EU

received 26 September 2008; accepted in final form 11 December 2008; published January 2009
published online 26 January 2009

We present a study of the transport properties of the heavy-fermion URu2Si2 in pulsed magnetic field. The large Nernst response of the hidden order state is found to be suppressed when the magnetic field exceeds 35 T. The combination of resistivity, Hall and Nernst data outlines the reconstruction of the Fermi surface in the temperature-field phase diagram. The zero-field ground state is a compensated heavy-electron semi-metal, which is destroyed by magnetic field through a cascade of field-induced transitions. Above 40 T, URu2Si2 appears to be a polarized heavy-fermions metal with a large density of carriers whose effective mass rapidly decreases with increasing magnetic polarization.

71.27.+a - Strongly correlated electron systems; heavy fermions.
72.15.Gd - Galvanomagnetic and other magnetotransport effects.
75.30.Mb - Valence fluctuation, Kondo lattice, and heavy-fermion phenomena.

© EPLA 2009