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16 Jun - 2.00 pm | Raman signatures of the Hidden Order state and the Kondo Physics of the heavy-fermion superconductor URu2Si2
Location : Salle de conférence René Pauthenet, LNCMI (Bâtiment J, 2ème étage)
25 rue des martyrs, 38000 Grenoble
Speaker : Marie-Aude MEASSON (Université Paris Diderot-Paris7, Laboratoire Matériaux et Phénomènes Quantiques)
We have performed polarized electronic Raman scattering on single crystals of URu2Si2 down to 8K in the hidden order (HO) state and under magnetic field up to 10T.
The HO state is characterized by a sharp excitation at 1.75meV and a gap in the electronic continuum below 6.8meV. Both Raman signatures are of pure A2g symmetry. By comparing the behavior of the sharp excitation and the resonance at E0 observed by neutron scattering at Q0=(0,0,1), we provide strong evidence that the HO state presents a new translational symmetry along the z-axis such that Γ and Z points fold on top of each other. The observation of these distinct Raman features of the peculiar A2g symmetry as a signature of the hidden order phase places strong constraints on current theories of the hidden order.
The Kondo cross-over is characterized by a large gap opening at high energy, symmetry restricted to the Eg symmetry. Thanks to Raman vertex calculation, we attribute this gap to interband excitation.
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