Possible Phase Transition Deep Inside the Hidden Order Phase of Ultraclean URu2Si2

Details Possible Phase Transition Deep Inside the Hidden Order Phase of Ultraclean URu2Si2 Possible Phase Transition Deep Inside the Hidden Order Phase of Ultraclean URu2Si2

2009-03-23

arxiv.org/abs/0903.3821v1

Phys. Rev. Lett. 102, 156403 (2009)

Physics

Condensed Matter

Strongly Correlated Electrons

4 pages, 4 figures, accepted for publication in Physical Review Letters

Scientific paper

10.1103/PhysRevLett.102.156403

To elucidate the underlying nature of the hidden order (HO) state in heavy-fermion compound URu2Si2, we measure electrical transport properties of ultraclean crystals in a high field/low temperature regime. Unlike previous studies, the present system with much less impurity scattering resolves a distinct anomaly of the Hall resistivity at H*=22.5 T well below the destruction field of the HO phase ~36 T. In addition, a novel quantum oscillation appears above a magnetic field slightly below H*. These results indicate an abrupt reconstruction of the Fermi surface, which implies a possible phase transition well within the HO phase caused by a band-dependent destruction of the HO parameter. The present results definitely indicate that the HO transition should be described by an itinerant electron picture.

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