Spin-state polaron in lightly hole-doped LaCoO_3

Details Spin-state polaron in lightly hole-doped LaCoO_3 Spin-state polaron in lightly hole-doped LaCoO_3

2008-04-18

arxiv.org/abs/0804.3059v1

Phys. Rev. Lett. 101, 247603 (2008)

Physics

Condensed Matter

Strongly Correlated Electrons

10 pages, 3 figures

Scientific paper

10.1103/PhysRevLett.101.247603

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.

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