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Magnetically induced femtoscale strain modulations in HoMn2O5

DOI: 10.1103/PhysRevB.89.125114 DOI Help

Authors: Carlo Vecchini (National Physical Laboratory) , Alessandro Bombardi (Diamond Light Source) , Laurent Chapon (ISIS) , Guillaume Beutier (CEA, INAC) , Paolo Radaelli (University of Oxford) , S. Park (Rutgers University, Piscataway) , S.-w. Cheong (Rutgers University, Piscataway)
Co-authored by industrial partner: No

Type: Journal Paper
Journal: Physical Review B , VOL 89 (12)

State: Published (Approved)
Published: March 2014
Diamond Proposal Number(s): 6066

Abstract: X-ray scattering was used to investigate the magnetically induced ionic displacements in the low-temperature commensurate ferroelectric/antiferromagnetic phase of the multiferroic HoMn2O5. The structural modulation signal appearing at twice the magnetic wave vector km = ( 1 2 0 1 4 ) has been used, combined with symmetry analysis, to determine a model for the ionic displacements up to a precision of 10−3 A° . The symmetry-breaking operations that are associated to the active irreducible representation have been experimentally determined from the analysis of the modulation modes. They reveal a lowering of symmetry to the polar point group m2m. Calculations based on the determined model show that the magnetic structure along the c direction is stabilized via nearest-neighbor and next-nearest-neighbor interactions through the rare-earth layer. We also show that by knowing both the magnetic and the magnetically induced strain waves patterns, it is possible to remove any phase ambiguity between the crystal and magnetic structures.

Journal Keywords: Strain; Magnetostriction; Magnetoelectric; Multiferroic; Superlattice; Femtoscale

Subject Areas: Physics, Materials, Technique Development

Instruments: I16-Materials and Magnetism