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Magnetic phase diagram and ordered ground state of GdMn2O5 multiferroic studied by x-ray magnetic scattering

DOI: 10.1088/1742-6596/519/1/012004 DOI Help

Authors: C. Vecchini (National Physical Laboratory) , A. Bombardi (Diamond Light Source) , L. C. Chapon (Institut Laue-Langevin; ISIS Facility) , N. Lee (Rutgers University) , P. G. Radaelli (University of Oxford) , S.-W. Cheong (Rutgers University, USA.)
Co-authored by industrial partner: No

Type: Conference Paper
Conference: REXS 2013 — Workshop on Resonant Elastic X-ray Scattering in Condensed Matter
Peer Reviewed: No

State: Published (Approved)
Published: May 2014

Open Access Open Access

Abstract: The magnetic structure of multiferroic GdMn2O5 is studied by x-ray magnetic scattering, both off resonance and in resonant conditions at the Gd LIII edge. Temperature dependence of magnetic Bragg reflections shows an initial incommensurate (ICM) ordering appearing at T~40K with magnetic propagation vector kICM ~(0.49 0 0.18) which condenses at T~33K in a commensurate (CM) wave vector kCM=(½ 0 0). In the CM phase Gd3+ ions appear to order spontaneously at the same temperature as Mn ions. Azimuthal scans allowed for the precise determination, from x-ray magnetic scattering only, of the orientation and magnitude of the Gd3+ magnetic moments. The Gd3+ magnetic isotropy allows for the Gd ions to mimic the Mn4+ magnetic sublattice via Gd-Mn-Gd superexchange interactions.

Journal Keywords: Bragg Reflection; Gadolinium Compounds; Gadolinium Ions; Ground States; Isotropy; Manganates; Manganese Ions; Orientation; Phase Diagrams; Temperature Dependence; X Radiation; X-Ray Diffraction

Diamond Keywords: Ferroelectricity; Antiferromagnetism

Subject Areas: Physics, Materials


Instruments: I16-Materials and Magnetism

Added On: 23/10/2014 15:58

Documents:
Vecchini_2014_J._Phys.%3A_Conf._Ser._519_012004.pdf

Discipline Tags:

Quantum Materials Multiferroics Physics Magnetism Materials Science

Technical Tags:

Scattering