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Symmetry-protected hidden order and magnetic neutron Bragg diffraction by URu 2 Si 2

DOI: 10.1088/0953-8984/26/4/046003 DOI Help

Authors: D. Khalyavin (ISIS Pulsed Neutron and Muon Source) , S. Lovesey (Diamond Light Source; ISIS Facility) , A. N. Dobrynin (Diamond Light Source) , E. Ressouche (SPSMS, UMR-E CEA/UJF-Grenoble) , R. Ballou (CNRS and Université Joseph Fourier) , J. Flouquet (SPSMS, UMR-E CEA/UJF-Grenoble)
Co-authored by industrial partner: No

Type: Journal Paper
Journal: Journal Of Physics: Condensed Matter , VOL 26 (4)

State: Published (Approved)
Published: January 2014

Abstract: 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.

Journal Keywords: Atomic Displacements; Bragg Reflection; Crystals; Magnetic Dipoles; Neutron Diffraction; Order Parameters; Phase Transformations; Space Groups; X Radiation

Subject Areas: Physics

Technical Areas: Theoretical Physics