Abstract
Neutron scattering experiments were performed on the single crystals of layered-perovskite cobaltate La 2− x Sr x CoO 4. For a commensurate value of x=0.5, magnetic reflections due to high-spin (HS) state of Co 2+ are observed in (H, 0, L) plane. Further, in (H, H, L) plane, we found super-lattice reflections with wave vector q m=(1/4, 1/4, 1). The latter magnetic peaks cannot be understood by the Co 2+ spin configurations, indicating that these peaks are originated from Co 3+ spin ordering. From the hole-doping dependence, short ranged charge and spin orderings were observed below x=0.5, while those of peaks were suppressed at x=0.6. Our results suggest that double exchange interaction between the HS state of Co 2+ and the intermediate spin (IS) state of Co 3+ mediate the IS state in this system.
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