Spin dynamical properties of the layered perovskite La1.2Sr1.8Mn2O7

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

• Book ID: 104152023
• Publisher: Elsevier Science
• Year: 1999
• Tongue: English
• Weight: 136 KB
• Volume: 60
• Category: Article
• ISSN: 0022-3697
• DOI: 10.1016/s0022-3697(99)00071-2

✦ Synopsis

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