On the destruction of the hidden order in URu$_2$Si$_2$ by a strong magnetic field

Details On the destruction of the hidden order in URu$_2$Si$_2$ by a strong magnetic field On the destruction of the hidden order in URu$_2$Si$_2$ by a strong magnetic field

2008-09-26

arxiv.org/abs/0809.4715v2

EPL 85, 27003 (2009)

Physics

Condensed Matter

Strongly Correlated Electrons

published version

Scientific paper

10.1209/0295-5075/85/27003

We present a study of transport properties of the heavy fermion URu$_2$Si$_2$ 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, URu$_2$Si$_2$ appears to be a polarized heavy fermions metal with a large density of carriers whose effective mass rapidly decreases with increasing magnetic polarization.

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