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  Quantum spin dynamics of the bilayer ferromagnet La1.2Sr1.8Mn2O7

Shannon, N., Chatterji, T., Ouchni, F., & Thalmeier, P. (2002). Quantum spin dynamics of the bilayer ferromagnet La1.2Sr1.8Mn2O7. European Physical Journal B, 27(3), 287-297. doi:10.1140/epjb/e2002-00157-2.

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Item Permalink: http://hdl.handle.net/11858/00-001M-0000-0015-314D-B Version Permalink: http://hdl.handle.net/11858/00-001M-0000-0018-048D-E
Genre: Journal Article

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 Creators:
Shannon, N.1, Author              
Chatterji, T., Author
Ouchni, F., Author
Thalmeier, P.2, Author              
Affiliations:
1Max Planck Institute for Chemical Physics of Solids, Max Planck Society, ou_1863404              
2Peter Thalmeier, Physics of Correlated Matter, Max Planck Institute for Chemical Physics of Solids, Max Planck Society, ou_1863457              

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 Abstract: We construct a theory of spin wave excitations in the bilayer manganite La1.2Sr1.8Mn2O7 based on the simplest possible double-exchange model, but including leading quantum corrections to the spin wave dispersion and damping. Comparison is made with recent inelastic neutron scattering experiments. We find that quantum effects account for some part of the measured damping of spin waves, but cannot by themselves explain the observed softening of spin waves at the zone boundary. Furthermore a doping dependence of the total spin wave dispersion and the optical spin wave gap is predicted.

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Language(s): eng - English
 Dates: 2002-06
 Publication Status: Published in print
 Pages: -
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 Table of Contents: -
 Rev. Method: Peer
 Identifiers: eDoc: 18495
ISI: 000176565700002
DOI: 10.1140/epjb/e2002-00157-2
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Title: European Physical Journal B
  Alternative Title : Eur. Phys. J. B
Source Genre: Journal
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Pages: - Volume / Issue: 27 (3) Sequence Number: - Start / End Page: 287 - 297 Identifier: ISSN: 1434-6028