1974/08/01 by F. Bourdarot, B. Fak, B. Fåk +5 · 1 citation
Engineering · Materials Science · Mathematics · Physics and Astronomy · #Antiferromagnetism #B meson #Condensed matter physics #Field (mathematics) #Geometry #Inflection point #Iron-based superconductors research #Magnetic field #Magnetic moment #Mathematics #Meson #Moment (physics) #Nuclear physics #Parity (physics) #Particle physics #Particle physics theoretical and experimental studies #Physics #Physics of Superconductivity and Magnetism #Quantum Chromodynamics and Particle Interactions #Quantum mechanics #Rare-earth and actinide compounds #Superconducting Materials and Applications #Tetragonal crystal system #cond-mat.str-el
paper · pdf · doi:10.1103/physrevlett.90.067203
10 pages, 5 figures, submitted to PRL
openalex publication_date 1974/08/01 · arxiv created 2002/09/03 · arxiv updated 2009/11/30 · openalex created_date 2016/06/24 · openalex updated_date 2026/06/11
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 T 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 approximately 40 T. This suggests that the moment m is connected to a hidden order parameter psi 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.