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Title: Neutron scattering studies of the ferroelectric distortion and spin dynamics in the type-1 multiferroic perovskite Sr 0.56 Ba 0.44 MnO 3

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 T-C = 305 K with a polarization of 4.2 mu C/cm(2) associated with the displacements of the Mn ions, while the Mn4+ spins order below T-N approximate to 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 is 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.

Authors:
; ; ; ; ; ;
Publication Date:
Research Org.:
Argonne National Lab. (ANL), Argonne, IL (United States)
Sponsoring Org.:
USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22)
OSTI Identifier:
1392343
DOE Contract Number:  
AC02-06CH11357
Resource Type:
Journal Article
Journal Name:
Physical Review. B, Condensed Matter and Materials Physics
Additional Journal Information:
Journal Volume: 90; Journal Issue: 14; Journal ID: ISSN 1098-0121
Publisher:
American Physical Society (APS)
Country of Publication:
United States
Language:
English

Citation Formats

Pratt, Daniel K., Lynn, Jeffrey W., Mais, James, Chmaissem, Omar, Brown, Dennis E., Kolesnik, Stanislaw, and Dabrowski, Bogdan. Neutron scattering studies of the ferroelectric distortion and spin dynamics in the type-1 multiferroic perovskite Sr0.56Ba0.44MnO3. United States: N. p., 2014. Web. doi:10.1103/PhysRevB.90.140401.
Pratt, Daniel K., Lynn, Jeffrey W., Mais, James, Chmaissem, Omar, Brown, Dennis E., Kolesnik, Stanislaw, & Dabrowski, Bogdan. Neutron scattering studies of the ferroelectric distortion and spin dynamics in the type-1 multiferroic perovskite Sr0.56Ba0.44MnO3. United States. doi:10.1103/PhysRevB.90.140401.
Pratt, Daniel K., Lynn, Jeffrey W., Mais, James, Chmaissem, Omar, Brown, Dennis E., Kolesnik, Stanislaw, and Dabrowski, Bogdan. Wed . "Neutron scattering studies of the ferroelectric distortion and spin dynamics in the type-1 multiferroic perovskite Sr0.56Ba0.44MnO3". United States. doi:10.1103/PhysRevB.90.140401.
@article{osti_1392343,
title = {Neutron scattering studies of the ferroelectric distortion and spin dynamics in the type-1 multiferroic perovskite Sr0.56Ba0.44MnO3},
author = {Pratt, Daniel K. and Lynn, Jeffrey W. and Mais, James and Chmaissem, Omar and Brown, Dennis E. and Kolesnik, Stanislaw and Dabrowski, Bogdan},
abstractNote = {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 T-C = 305 K with a polarization of 4.2 mu C/cm(2) associated with the displacements of the Mn ions, while the Mn4+ spins order below T-N approximate to 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 is 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.},
doi = {10.1103/PhysRevB.90.140401},
journal = {Physical Review. B, Condensed Matter and Materials Physics},
issn = {1098-0121},
number = 14,
volume = 90,
place = {United States},
year = {2014},
month = {10}
}

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