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Article Dans Une Revue Journal of Physics: Condensed Matter Année : 2014

Symmetry protected hidden order and magnetic neutron Bragg diffraction by URu2Si2

Résumé

We investigate how the order parameter of a continuous phase transition can be protected from view by symmetry in a magnetic crystal. The symmetry in question forbids atomic displacements and formation of magnetic dipoles, rendering the order parameter invisible in standard x-ray and magnetic neutron Bragg diffraction. Analysis of the allowed magnetic space-groups reveals exact properties of the hidden order parameter. We demonstrate that Bragg spots forbidden by the chemical structure can unveil magnetic hidden order. The method is applied to URu2Si2, which has been thoroughly investigated in the past few decades using all manner of experimental techniques. Starting from the established chemical structure of URu2Si2, we have performed a critical analysis of available data for magnetic neutron Bragg diffraction.
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Dates et versions

hal-00963830 , version 1 (22-03-2014)

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Dmitry Khalyavin, Stephen Lovesey, Alexey Dobrynin, Eric Ressouche, Rafik Ballou, et al.. Symmetry protected hidden order and magnetic neutron Bragg diffraction by URu2Si2. Journal of Physics: Condensed Matter, 2014, 26 (4), pp.046003. ⟨10.1088/0953-8984/26/4/046003⟩. ⟨hal-00963830⟩
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