Interplay of magnetism,Fermi surface reconstructions, and hidden order in the heavy-fermion material URu2Si2

URu2Si2 is surely one of the most mysterious of the heavy-fermion compounds. Despite more than 20 years of experimental and theoretical works, the order parameter of the transition at T-0 = 17.5 K is still unknown. The state below T-0 is still called the "hidden-order phase," and the stake...

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Veröffentlicht in:Physical review. B, Condensed matter and materials physics Condensed matter and materials physics, 2012-03, Vol.85
Hauptverfasser: Scheerer, Gernot Werner, Knafo, William, Aoki, D., Ballon, Géraldine, Mari, A., Vignolles, David, J. Flouquet, And
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Sprache:eng
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Zusammenfassung:URu2Si2 is surely one of the most mysterious of the heavy-fermion compounds. Despite more than 20 years of experimental and theoretical works, the order parameter of the transition at T-0 = 17.5 K is still unknown. The state below T-0 is still called the "hidden-order phase," and the stakes are still to identify the energy scales driving the system to this phase. We present new magnetoresistivity and magnetization measurements performed on very-high-quality single crystals in pulsed magnetic fields up to 60 T. We show that the transition to the hidden-order state in URu2Si2 is initially driven by a high-temperature crossover at around 40-50 K, which is a fingerprint of intersite electronic correlations. In a magnetic field H applied along the easy-axis c, the vanishing of this high-temperature scale precedes the polarization of the magnetic moments, as well as driving the destabilization of the hidden-order phase. Strongly impurity-dependent magnetoresistivity confirms that the Fermi surface is reconstructed below T-0 and is strongly modified in a high magnetic field applied along c, i.e., at a sufficiently high magnetic polarization. The possibility of a sharp crossover in the hidden-order state controlled by a field-induced change of the Fermi surface is pointed out.
ISSN:1098-0121
1550-235X
DOI:10.1103/PhysRevB.85.094402