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

被引：6
作者：
Vecchini, C. [1 ,2 ]
Bombardi, A. [1 ]
Chapon, L. C. [3 ,4 ]
Lee, N. [5 ]
Radaelli, P. G. [6 ]
Cheong, S-W. [5 ]
机构：
[1] Diamond Light Source Ltd, Harwell Sci & Innovat Campus, Didcot OX11 0DE, Oxfordshire, England
[2] Natl Phys Lab, Teddington TW11 0LW, Middx, England
[3] Inst Laue Langevin, F-38042 Grenoble, France
[4] Rutherford Appleton Lab, ISIS Fac, STFC, Didcot OX11 0QX, Oxon, England
[5] Rutgers State Univ, Rutgers Ctr Emergent Mat, Dept Phys & Astron, Piscataway, NJ 08854 USA
[6] Univ Oxford, Dept Phys, Oxford OX1 3PU, England
来源：
REXS 2013 - WORKSHOP ON RESONANT ELASTIC X-RAY SCATTERING IN CONDENSED MATTER | 2014年 / 519卷
基金：
英国工程与自然科学研究理事会;
关键词：
POLARIZATION DEPENDENCE;
D O I：
10.1088/1742-6596/519/1/012004
中图分类号：
O4 [物理学];
学科分类号：
0702 ;
摘要：
The magnetic structure of multiferroic GdMn2O5 is studied by x-ray magnetic scattering, both off resonance and in resonant conditions at the Gd L-III edge. Temperature dependence of magnetic Bragg reflections shows an initial incommensurate (ICM) ordering appearing at T similar to 40K with magnetic propagation vector k(ICM) similar to(0.49 0 0.18) which condenses at T similar to 33K in a commensurate (CM) wave vector k(CM)=(1/2 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
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页数：9
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