Abstract
Inelastic neutron-scattering measurements were performed on a single crystal of the layered colossal magnetoresistance (CMR) material La 1.2Sr 1.8Mn 2O 7 ( T C∽120 K). We found that the spin wave dispersion is almost perfectly two-dimensional with the in-plane spin stiffness constant D∽151 meV Å. The value is similar to that of similarly doped La 1− x Sr x MnO 3 though its T c 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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