Spin-state polaron in lightly hole-doped LaCoO_3

Abstract

Inelastic neutron scattering (INS), electron spin (ESR) and nuclear magnetic resonance (NMR) measurements were employed to establish the origin of the strong magnetic signal in lightly hole-doped La_{1-x}Sr_xCoO_3, x=0.002. Both, INS and ESR low temperature spectra show intense excitations with large effective g-factors ~10-18. NMR data indicate the creation of extended magnetic clusters. From the Q-dependence of the INS magnetic intensity we conclude that the observed anomalies are caused by the formation of octahedrally shaped spin-state polarons comprising seven Co ions.

10 pages, 3 figures

References in corpus (3)

• Spin-state transition in LaCoO3: direct neutron spectroscopic evidence of excited magnetic states
• Tuning the magnetic ground state of a novel tetranuclear Nickel(II) molecular complex by high magnetic fields
• Effect of light Sr doping on the spin-state transition in LaCoO_3

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