Spin-State Polarons in Lightly-Hole-Doped LaCoO3статья
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Дата последнего поиска статьи во внешних источниках: 15 февраля 2024 г.
Аннотация: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 La 1− x Sr x CoO 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. The present INS, ESR, and NMR data give evidence for two regimes in the lightly-hole-doped samples:(i) T< 35 K dominated by spin polarons;(ii) T> 35 K dominated by thermally activated magnetic Co 3+ ions.