Spin-state polaron in lightly hole-doped LaCoO_3

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

doi:10.1103/PhysRevLett.101.247603

Spin-state polaron in lightly hole-doped LaCoO_3

Strongly Correlated Electrons 2008-12-15 v1

Authors: 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 (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_xCoO_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.

Keywords

spin excitations in condensed matter frustrated magnetism spin polarization and magnetic phenomena

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@article{arxiv.0804.3059,
  title  = {Spin-state polaron in lightly hole-doped LaCoO_3},
  author = {A. Podlesnyak and M. Russina and A. Furrer and A. Alfonsov and E. Vavilova and V. Kataev and B. Büchner and Th. Strässle and E. Pomjakushina and K. Conder and D. I. Khomskii},
  journal= {arXiv preprint arXiv:0804.3059},
  year   = {2008}
}

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10 pages, 3 figures

Spin-state polaron in lightly hole-doped LaCoO_3

Abstract

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