Berlin 2012 – wissenschaftliches Programm
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TT: Fachverband Tiefe Temperaturen
TT 3: Correlated Electrons: Heavy Fermions
TT 3.10: Vortrag
Montag, 26. März 2012, 12:00–12:15, H 3005
High-field study of the heavy-fermion material URu2Si2 — •Gernot Werner Scheerer1, William Knafo1, Dai Aoki2, Geraldine Ballon1, Cyril Jaudet1, Alain Mari3, Cyril Proust1, David Vignolles1, and Jacques Flouquet2 — 1Laboratoire National des Champs Magnétiques Intenses, UPR 3228, CNRS- UJF-UPS-INSA, Toulouse, France — 2Institut Nanosciences et Cryogénie, SPSMS, CEA-Grenoble, France — 3Laboratoire de Chimie de Coordination, Toulouse, France
URu2Si2 is known for its "hidden-order" state below T0=17.5 K, where the order parameter is still not identified [1]. A magnetic field along the c-axis induces a cascade of low-temperature phase transitions between 35 and 39 T from the "hidden order" to a polarized paramagnetic state. We have performed electrical transport and magnetization measurements in pulsed magnetic fields on ultra clean URu2Si2 samples. We established the H-T-phase diagram for H∥ c in extended scales up to 60 T and 60 K. The vanishing of a high-temperature crossover at around 40-50 K, presumably related to intersite electronic correlations, precedes the polarization of the magnetic moments, as well as the destabilization of the "hidden-order" phase. Strongly sample-quality dependent magnetoresistivity confirms the Fermi surface reconstructions in a high magnetic field along c and at T0 [2,3]. Shubnikov-de Haas quantum oscillations will also be presented.
J. A. Mydosh and P. M. Oppeneer, arXiv:1107.0258
E. Hassinger et al.: Phys. Rev. Lett. 105 (2010) 216409
M.M. Altarawneh et al.: Phys. Rev. Lett. 106 (2011) 146403