Physics – Condensed Matter – Strongly Correlated Electrons
Scientific paper
2002-09-03
Physics
Condensed Matter
Strongly Correlated Electrons
10 pages, 5 figures, submitted to PRL
Scientific paper
10.1103/PhysRevLett.90.067203
We have measured the magnetic field dependence of the ordered antiferromagnetic moment and the magnetic excitations in the heavy-fermion superconductor URu2Si2 for fields up to 17 Tesla applied along the tetragonal c axis, using neutron scattering. The decrease of the magnetic intensity of the tiny moment with increasing field does not follow a simple power law, but shows a clear inflection point, indicating that the moment disappears first at the metamagnetic transition at ~40 T. This suggests that the moment m is connected to a hidden order parameter Phi which belongs to the same irreducible representation breaking time-reversal symmetry. The magnetic excitation gap at the antiferromagnetic zone center Q=(1,0,0) increases continuously with increasing field, while that at Q=(1.4,0,0) is nearly constant. This field dependence is opposite to that of the gap extracted from specific-heat data.
Bourdarot Frederic
Fåk B.
Habicht Klaus
Prokes Karel
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