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

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

1999-02-18

arxiv.org/abs/cond-mat/9902253v1

Physics

Condensed Matter

Strongly Correlated Electrons

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

Scientific paper

10.1016/S0022-3697(99)00071-2

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.

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