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Report No.

Spin fluctuations in oxygen doped layered perovskite cobalt oxide

Nakajima, Kenji  ; Kajimoto, Ryoichi  ; Yamada, Kazuyoshi*; Horigane, Kazumasa*

Carrier doping into transition metal oxides triggers various phenomena, which have been subjected to intensive investigations. Layered oxide La$$_{2}$$MO$$_{4}$$ (M: 3d metal) is one of the model systems for such studies. In cobalates, contribution of orbital moment and possible spin state of Co$$^{3+}$$ give further complexity. In La$$_{1.5}$$Sr$$_{0.5}$$CoO$$_{4}$$, charges order in checker-board style and Co$$^{2+}$$ spin correlations are modulated in momentum space by the ordered charges. (1) Magnetic excitations in this system are reported to be accounted for spin-waves of Co$$^{2+}$$ spins taking into account the orbital moment. (2) In this study, we have investigated magnetic excitations in another almost half-doped system La$$_{2}$$CoO$$_{4.24}$$ by inelastic neutron scattering. Clear spin-wave excitations consistent to previous report on La$$_{1.5}$$Sr$$_{0.5}$$CoO$$_{4}$$ were observed. However, we also observed an additional excitations with different zone center positions as well as excitation with higher spin-wave velocity. We expect detail analysis of present results can provide a key clue to understand the mechanism of complicated magnetic excitations caused by doped carrier, spin-orbital coupling and spins in transition metal oxides.



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