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A new chiral phase of BiFeO3 evidenced from resonant x-ray Bragg diffraction
DOI:
10.1088/1742-6596/519/1/012012
Authors:
Angel
Rodriguez-fernandez
(University of Oviedo)
,
Stephen
Lovesey
(Diamond Light Source)
,
Steve
Collins
(Diamond Light Source)
,
Gareth
Nisbet
(Diamond Light Source)
,
J A
Blanco Rodriguez
(Universidad de Oviedo)
Co-authored by industrial partner:
No
Type:
Conference Paper
Conference:
REXS 2013 Workshop on Resonant Elastic X-ray Scattering in Condensed Matter
Peer Reviewed:
Yes
State:
Published (Approved)
Published:
May 2014
Diamond Proposal Number(s):
7720

Abstract: Results that support a new chiral phase in the only multiferroic material known above room temperature have been obtained by a resonant x-ray Bragg diffraction experiment, with the incoming x-ray beam tuned near the Fe K-edge (7.1135 keV), performed in its ferroelectric phase. The R3c forbidden reflection (0,0,9)H was studied as a function of the rotation of the crystal about the Bragg wavector in both phases, paramagnetic (700 K) and antiferromagnetic (300 K). The data gathered is consistent with a chiral structure formed by a circular cycloid propagating along (1,1,0)H. Templeton and Templeton (T&T) scattering at 700 K is attributed in part to charge-like quadrupoles absent in a standard model of a cycloid in which a material vector generates all electronic states of the resonant ion. Extensive sets of azimuthal-angle data are used to infer values of three atomic multipoles in a satisfactory minimal model of the iron electronic structure, with a quadrupole (E1-E1 event) and a hexadecapole (E2-E2 event) contributing T&T scattering, plus a magnetic dipole (E1-E1).
Journal Keywords: Antiferromagnetism; Bismuth Compounds; Bragg Reflection; Chirality; Crystals; Electronic Structure; Ferrites; Ferroelectric Materials; Indium Fluorides; Iron; Magnetic Dipoles; Paramagnetism; Quadrupoles; Temperature Dependence; Trigonal Lattices
Subject Areas:
Materials
Instruments:
I16-Materials and Magnetism
Added On:
23/03/2015 15:51
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