Spin-state polarons in lightly-hole-doped LaCoO3

A. Podlesnyak, M. Russina, A. Furrer, A. Alfonsov, E. Vavilova, V. Kataev, B. Büchner, Th Strässle, E. Pomjakushina, K. Conder, D. I. Khomskii

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Abstract

Inelastic neutron scattering (INS), electron spin resonance (ESR), and nuclear magnetic resonance (NMR) measurements were employed to establish the origin of the strong magnetic signal in lightly-hole-doped La1-xSrxCoO3, 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. The present INS, ESR, and NMR data give evidence for two regimes in the lightly-hole-doped samples: (i) T<35K dominated by spin polarons; (ii) T>35K dominated by thermally activated magnetic Co3+ ions.

Original languageEnglish
Article number247603
JournalPhysical Review Letters
Volume101
Issue number24
DOIs
StatePublished - Dec 8 2008
Externally publishedYes

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