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Neutron Scattering Studies of the Ferroelectric Distortion and Spin Dynamics in the Type-1 Multiferroic Perovskite Sr0.56Ba0.44MnO3

Published

Author(s)

Daniel K. Pratt, Jeffrey W. Lynn, James Mais, Omar Chmaissem, Dennis E. Brown, Stanislaw Kolesnik, Bogdan Dabrowski

Abstract

The magnetic order, spin dynamics, and crystal structure of the multiferroic Sr0.56Ba0.44MnO3 have been investigated using neutron and x-ray scattering. Ferroelectricity develops at Tc=305 K with a polarization of 4.2 υC/cm2 associated with the displacements of the Mn ions, while the Mn4+ spins order below I]TN approximately equal} 200 K into a simple G-type commensurate magnetic structure. Below TN the ferroelectric order decreases dramatically demonstrating that the two order parameters are strongly coupled. The ground state spin dynamics are characterized by a spin gap of 4.6(5) meV and the magnon density of states peaking at 43 meV. Detailed spin wave simulations with a gap and isotropic exchange of J=4.8(2) meV describe the excitation spectrum well. Above TN strong spin correlations coexist with robust ferroelectric order.
Citation
Physical Review B
Volume
90
Issue
14

Keywords

Multiferroic, Ferroelectric Order, Magnetic Order, Spin Dynamics, Neutron Scattering, Magnon Density of States

Citation

Pratt, D. , Lynn, J. , Mais, J. , Chmaissem, O. , Brown, D. , Kolesnik, S. and Dabrowski, B. (2014), Neutron Scattering Studies of the Ferroelectric Distortion and Spin Dynamics in the Type-1 Multiferroic Perovskite Sr<sub>0.56</sub>Ba<sub>0.44</sub>MnO<sub>3</sub>, Physical Review B, [online], https://tsapps.nist.gov/publication/get_pdf.cfm?pub_id=916281 (Accessed April 20, 2024)
Created October 8, 2014, Updated October 12, 2021