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Azuma, Masaki*; Saito, Takashi*; Ishiwata, Shintaro*; Yoshida, Hirofumi*; Takano, Mikio*; Kosaka, Yuki*; Takagi, Hidenori*; Utsumi, Wataru
Journal of Physics; Condensed Matter, 14(44), p.11321 - 11324, 2002/11
Times Cited Count:11 Percentile:50.69(Physics, Condensed Matter)no abstracts in English
Nakajima, Kenji; Kajimoto, Ryoichi; Yamada, Kazuyoshi*; Horigane, Kazumasa*
no journal, ,
Carrier doping into transition metal oxides triggers various phenomena, which have been subjected to intensive investigations. Layered oxide LaMO (M: 3d metal) is one of the model systems for such studies. In cobalates, contribution of orbital moment and possible spin state of Co give further complexity. In LaSrCoO, charges order in checker-board style and Co 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 spins taking into account the orbital moment. (2) In this study, we have investigated magnetic excitations in another almost half-doped system LaCoO by inelastic neutron scattering. Clear spin-wave excitations consistent to previous report on LaSrCoO 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.
Nakajima, Kenji; Kajimoto, Ryoichi
no journal, ,
no abstracts in English