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Title: Low-energy spin-wave excitations in the bilayer manganite La{sub 1.2}Sr{sub 1.8}Mn{sub 2}O{sub 7}

Abstract

Inelastic neutron scattering experiments were performed on a single crystal of the bilayer manganite La{sub 1.2}Sr{sub 1.8}Mn{sub 2}O{sub 7}. Low-energy spin-wave excitations were observed along the c direction with a maximum energy of {approx} 0.5 meV at the zone boundary. The dispersion of these acoustic spin wave modes is modeled by a nearest-neighbor Heisenberg model with an interbilayer exchange interaction between neighboring spins in different bilayers of 0.048(1) meV and an anisotropy gap of {delta} 0.077(3) meV. These results confirm the two-dimensional nature of the spin correlations in the bilayer manganites, with a ratio of the in-plane to interbilayer interaction of {approx} 200. The temperature dependence of the energies and intensities of the spin wave excitations are in agreement with our earlier conclusion that the ferromagnetic transition is second order. (c) 2000 American Institute of Physics.

Authors:
 [1];  [1];  [1];  [2];  [3];  [2];  [4]
  1. Materials Science Division, Argonne National Laboratory, Argonne, Illinois 60439 (United States)
  2. NIST Center for Neutron Research, National Institute for Standards and Technology, Gaithersburg, Maryland 20899 (United States)
  3. (United States)
  4. Advanced Photon Source, Argonne National Laboratory, Argonne, Illinois 60439 (United States)
Publication Date:
OSTI Identifier:
20216250
Resource Type:
Journal Article
Journal Name:
Journal of Applied Physics
Additional Journal Information:
Journal Volume: 87; Journal Issue: 9; Other Information: PBD: 1 May 2000; Journal ID: ISSN 0021-8979
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; 75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; LANTHANUM OXIDES; STRONTIUM OXIDES; MANGANESE OXIDES; SPIN WAVES; NEUTRON DIFFRACTION; INELASTIC SCATTERING; MONOCRYSTALS; DISPERSION RELATIONS; HEISENBERG MODEL; EXCHANGE INTERACTIONS; EXPERIMENTAL DATA; THEORETICAL DATA

Citation Formats

Rosenkranz, S., Osborn, R., Mitchell, J. F., Vasiliu-Doloc, L., Department of Physics, University of Maryland, College Park, Maryland 20742, Lynn, J. W., and Sinha, S. K. Low-energy spin-wave excitations in the bilayer manganite La{sub 1.2}Sr{sub 1.8}Mn{sub 2}O{sub 7}. United States: N. p., 2000. Web. doi:10.1063/1.372532.
Rosenkranz, S., Osborn, R., Mitchell, J. F., Vasiliu-Doloc, L., Department of Physics, University of Maryland, College Park, Maryland 20742, Lynn, J. W., & Sinha, S. K. Low-energy spin-wave excitations in the bilayer manganite La{sub 1.2}Sr{sub 1.8}Mn{sub 2}O{sub 7}. United States. doi:10.1063/1.372532.
Rosenkranz, S., Osborn, R., Mitchell, J. F., Vasiliu-Doloc, L., Department of Physics, University of Maryland, College Park, Maryland 20742, Lynn, J. W., and Sinha, S. K. Mon . "Low-energy spin-wave excitations in the bilayer manganite La{sub 1.2}Sr{sub 1.8}Mn{sub 2}O{sub 7}". United States. doi:10.1063/1.372532.
@article{osti_20216250,
title = {Low-energy spin-wave excitations in the bilayer manganite La{sub 1.2}Sr{sub 1.8}Mn{sub 2}O{sub 7}},
author = {Rosenkranz, S. and Osborn, R. and Mitchell, J. F. and Vasiliu-Doloc, L. and Department of Physics, University of Maryland, College Park, Maryland 20742 and Lynn, J. W. and Sinha, S. K.},
abstractNote = {Inelastic neutron scattering experiments were performed on a single crystal of the bilayer manganite La{sub 1.2}Sr{sub 1.8}Mn{sub 2}O{sub 7}. Low-energy spin-wave excitations were observed along the c direction with a maximum energy of {approx} 0.5 meV at the zone boundary. The dispersion of these acoustic spin wave modes is modeled by a nearest-neighbor Heisenberg model with an interbilayer exchange interaction between neighboring spins in different bilayers of 0.048(1) meV and an anisotropy gap of {delta} 0.077(3) meV. These results confirm the two-dimensional nature of the spin correlations in the bilayer manganites, with a ratio of the in-plane to interbilayer interaction of {approx} 200. The temperature dependence of the energies and intensities of the spin wave excitations are in agreement with our earlier conclusion that the ferromagnetic transition is second order. (c) 2000 American Institute of Physics.},
doi = {10.1063/1.372532},
journal = {Journal of Applied Physics},
issn = {0021-8979},
number = 9,
volume = 87,
place = {United States},
year = {2000},
month = {5}
}