Spin Dynamical Properties of the Layered Perovskite La1.2Sr1.8Mn2O7

H. Fujioka; M. Kubota; K. Hirota; H. Yoshizawa; Y. Moritomo; Y. Endoh

doi:10.1016/S0022-3697(99)00071-2

Spin Dynamical Properties of the Layered Perovskite La1.2Sr1.8Mn2O7

Strongly Correlated Electrons 2009-10-31 v1

Authors: H. Fujioka , M. Kubota , K. Hirota , H. Yoshizawa , Y. Moritomo , Y. Endoh

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Abstract

Inelastic neutron-scattering measurements were performed on a single crystal of the layered colossal magnetoresistance (CMR) material La1.2Sr1.8Mn2O7 (Tc ~ 120K). We found that the spin wave dispersion is almost perfectly two-dimensional with the in-plane spin stiffness constant D ~ 151meVA. The value is similar to that of similarly doped La1-xSrxMnO3 though its Tc is three times higher, indicating a large renormalization due to low dimensionality. There exist two branches due to a coupling between layers within a double-layer. The out-of-plane coupling is about 30% of the in-plane coupling though the Mn-O bond lengths are similar.

Keywords

inelastic neutron scattering spin wave perovskite manganite magnetoresistance layered structure

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@article{arxiv.cond-mat/9902253,
  title  = {Spin Dynamical Properties of the Layered Perovskite La1.2Sr1.8Mn2O7},
  author = {H. Fujioka and M. Kubota and K. Hirota and H. Yoshizawa and Y. Moritomo and Y. Endoh},
  journal= {arXiv preprint arXiv:cond-mat/9902253},
  year   = {2009}
}

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3 pages, 3 figures J. Phys. Chem. Solids in press

Spin Dynamical Properties of the Layered Perovskite La1.2Sr1.8Mn2O7

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