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Evidence for Magnetic Polarons in Hole-Doped Cobalt Perovskites

Published online by Cambridge University Press:  01 February 2011

Andrey Podlesnyak ,
Albert Furrer ,
Thierry Straessle ,
Ekaterina Pomjakushina ,
Kazimierz Conder  and
Daniel Khomskii
Andrey Podlesnyak
Affiliation:
podlesnyakaa@ornl.gov, Oak Ridge National Laboratory, Neutron Scattering Science Division, Oak Ridge, Tennessee, United States
Albert Furrer
Affiliation:
albert.furrer@psi.ch, ETH Zurich & PSI, Laboratory for Neutron Scattering, Villigen, Switzerland
Thierry Straessle
Affiliation:
thierry.straessle@psi.ch, Paul Scherrer Institute, Villigen, Switzerland
Ekaterina Pomjakushina
Affiliation:
ekaterina.pomjakushina@psi.ch, Paul Scherrer Institute, Villigen, Switzerland
Kazimierz Conder
Affiliation:
kazimierz.conder@psi.ch, Paul Scherrer Institute, Villigen, Switzerland
Daniel Khomskii
Affiliation:
khomskii@ph2.uni-koeln.de, University of Cologne, Institute of Physics II, Cologne, Germany
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Abstract

A substitution of La3+ by Sr2+ in LaCoO3 induces holes in the low-spin ground state of the Co ions, which behave like magnetic impurities with a very high spin value (13 μB per hole). In this work, using single-crystal neutron spectroscopy, we prove that the charges introduced by strontium doping do not remain localized at the cobalt sites. Instead, each hole not only creates Co4+ in low-spin state, but it also transforms the six nearest neighboring Co3+ ions to the intermediate-spin state thereby forming a magnetic seven-site (heptamer) polaron. Spin-state polarons behave like magnetic nanoparticles embedded in an insulating nonmagnetic matrix. Therefore, lightly doped La1-xSrxCoO3 is a natural analog to artificial structures composed of ferromagnetic particles in insulating matrices.

Keywords

Comagnetic propertiesneutron scattering
Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 1256: Symposium N – Functional Oxide Nanostructures and Heterostructures , 2010 , 1256-N04-02
Copyright
Copyright © Materials Research Society 2010

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