High Field Studies of the Hidden Order Transition in URu$_2$Si$_2$

Details High Field Studies of the Hidden Order Transition in URu$_2$Si$_2$ High Field Studies of the Hidden Order Transition in URu$_2$Si$_2$

2002-09-20

arxiv.org/abs/cond-mat/0209500v1

Phys. Rev. Lett., vol.89, 287201 (2002)

Physics

Condensed Matter

Strongly Correlated Electrons

4 pages, 3 figures Submitted May 10, 2002. Revised Sep 17, 2002

Scientific paper

10.1103/PhysRevLett.89.287201

We studied in detail the low temperature/high magnetic field phases of URu$_{2}$Si$_{2}$ single crystals with specific heat, magnetocaloric effect, and magnetoresistance in magnetic fields up to 45 T. Data obtained down to 0.5 K, and extrapolated to T = 0, show a suppression of the hidden order phase at H$_{o}$(0) = 35.9 $\pm$ 0.35 T and the appearance of a new phase for magnetic fields in excess of H$_{1}$(0) = 36.1 $\pm$ 0.35 T observed \textit{only} at temperatures lower than 6 K. In turn, complete suppression of this high field state is attained at a critical magnetic field H$_{2}$(0) = 39.7 $\pm$ 0.35 T. No phase transitions are observed above 40 T. We discuss our results in the context of itinerant vs. localized \textit{f}-electron behavior and consider the implications for the hidden order phase.

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