Abstract
We investigate the doping dependence of the nanoscale electronic and magnetic inhomogeneities in the hole-doping range 0.002≤x≤0.1 of cobalt based perovskites, La1-xSrxCoO3. Using single-crystal inelastic neutron scattering and magnetization measurements we show that the lightly doped system exhibits magnetoelectronic phase separation in the form of spin-state polarons. Higher hole doping leads to a decay of spin-state polarons in favor of larger scale magnetic clusters, due to competing ferromagnetic correlations of Co3+ ions which are formed by neighboring polarons. The present data give evidence for two regimes of magnetoelectronic phase separation in this system: (i) xb 20.05, dominated by ferromagnetic intrapolaron interactions, and (ii) xb 30.05, dominated by Co3+-Co3+ intracluster interactions. Our conclusions are in good agreement with a recently proposed model of the phase separation in cobalt perovskites.
Original language | English |
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Article number | 134430 |
Journal | Physical Review B - Condensed Matter and Materials Physics |
Volume | 83 |
Issue number | 13 |
DOIs | |
State | Published - Apr 21 2011 |