TY - JOUR
T1 - Spin-state polarons in lightly-hole-doped LaCoO3
AU - Podlesnyak, A.
AU - Russina, M.
AU - Furrer, A.
AU - Alfonsov, A.
AU - Vavilova, E.
AU - Kataev, V.
AU - Büchner, B.
AU - Strässle, Th
AU - Pomjakushina, E.
AU - Conder, K.
AU - Khomskii, D. I.
PY - 2008/12/8
Y1 - 2008/12/8
N2 - 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.
AB - 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.
UR - http://www.scopus.com/inward/record.url?scp=57949109176&partnerID=8YFLogxK
U2 - 10.1103/PhysRevLett.101.247603
DO - 10.1103/PhysRevLett.101.247603
M3 - Article
AN - SCOPUS:57949109176
SN - 0031-9007
VL - 101
JO - Physical Review Letters
JF - Physical Review Letters
IS - 24
M1 - 247603
ER -