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Title: Coupled short-range ferroelectric and magnetic order in PbFe1/2Nb1/2O3
Authors: Stock, C
Dunsiger, SR
Mole, RA
Li, XB
Luo, H
Keywords: Neutrons
Ferroelectric materials
Phase transformations
Temperature dependence
Issue Date: 13-Sep-2013
Publisher: American Physical Society
Citation: Stock, C., Dunsiger, S. R., Mole, R. A., Li, X., & Luo, H. (2013). Coupled short-range ferroelectric and magnetic order in PbFe1/2Nb1/2O3. Physical Review B, 88(9), Article Number 094105. doi:10.1103/PhysRevB.88.094105
Abstract: A neutron scattering investigation of the magnetoelectric coupling in PbFe1/2Nb1/2O3 has been undertaken. Ferroelectric order occurs below 400 K, as evidenced by the softening with temperature and subsequent recovery of the zone center transverse optic phonon mode energy ((h) over bar Omega(0)). Over the same temperature range, magnetic correlations become resolution limited on a terahertz energy scale. In contrast to the behavior of nonmagnetic disordered ferroelectrics [namely Pb(Mg, Zn)(1/3)Nb2/3O3], we report the observation of a strong deviation from linearity in the temperature dependence of ((h) over bar Omega(0))(2). This deviation is compensated by a corresponding change in the energy scale of the magnetic excitations, as probed through the first moment of the inelastic response. The coupling between the short-range ferroelectric and antiferromagnetic correlations is consistent with calculations showing that the ferroelectricity is driven by the displacement of the body-centered iron site, illustrating the multiferroic nature of magnetic-lead-based relaxors in the dynamical regime. © 2013, American Physical Society.
Gov't Doc #: 5432
ISSN: 1098-0121
Appears in Collections:Journal Articles

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