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Type: Artigo de periódico
Title: Polar atomic displacements in multiferroics observed via anomalous x-ray diffraction
Author: Azimonte, C
Granado, E
Terashita, H
Park, S
Cheong, SW
Abstract: The minute polar atomic displacements in multiferroics are shown to be within the reach of crystallography. A nonconventional methodology with anomalous x-ray diffraction is employed to investigate such displacements in DyMn(2)O(5) with giant magnetoelectric coupling and two distinct Mn(3+) and Mn(4+) sites. Intensity differences of a selected Bragg reflection were measured as the direction of electric polarization is switched by a poling field. A significant differential effect, which is strongly enhanced at energies near and above the Mn K edge, was observed near and below the ferroelectric transition temperature, T(c) similar to 40 K. The direct participation of ionic displacements in the ferroelectric polarization, particularly the Mn(3+) sublattice, is demonstrated, dismissing a purely electronic mechanism for the multiferroicity.
Country: EUA
Editor: Amer Physical Soc
Citation: Physical Review B. Amer Physical Soc, v. 81, n. 1, 2010.
Rights: aberto
Identifier DOI: 10.1103/PhysRevB.81.012103
Date Issue: 2010
Appears in Collections:Unicamp - Artigos e Outros Documentos

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