Microscopic origin of the magnetoelectronic phase separation in Sr-doped LaCoO3

Zoltán Németh, András Szabó, Karel Knížek, Marcin Sikora, Roman Chernikov, Norbert Sas, Csilla Bogdán, Dénes Lajos Nagy, and György Vankó
Phys. Rev. B 88, 035125 – Published 19 July 2013

Abstract

The nanoscopic magnetoelectronic phase separation in doped La1xSrxCoO3 perovskites was studied with local probes. The phase separation is directly observed by Mössbauer spectroscopy in the studied doping range of 0.05 x 0.25 both at room temperature and in the low-temperature magnetic phase. Extended with current synchrotron-based x-ray spectroscopies, these data help to characterize the volume as well as the local electric and magnetic properties of the distinct phases. A simple model based on a random distribution of the doping Sr ions describes well both the evolution of the separated phases and the variation of the Co spin state. The experiments suggest that Sr doping initiates small droplets and a high degree of doping-driven cobalt spin-state transition, while the Sr-free second phase vanishes rapidly with increasing Sr content.

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  • Received 9 May 2013

DOI:https://doi.org/10.1103/PhysRevB.88.035125

©2013 American Physical Society

Authors & Affiliations

Zoltán Németh1,2, András Szabó1,3, Karel Knížek4, Marcin Sikora5, Roman Chernikov6, Norbert Sas1, Csilla Bogdán1, Dénes Lajos Nagy1, and György Vankó1

  • 1Wigner Research Centre for Physics, Hungarian Academy of Sciences, H-1525 Budapest, P.O.B. 49, Hungary
  • 2Department of Nuclear Chemistry, Eötvös Loránd University, Pázmány sétány 1/A, H-1118 Budapest, Hungary
  • 3Institute of Physics, University of Szeged, Dóm tér 9, H-6720 Szeged, Hungary
  • 4Institute of Physics ASCR, Cukrovarnická 10, 162 00 Prague 6, Czech Republic
  • 5AGH University of Science and Technology, Faculty of Physics and Applied Computer Science, Solid State Physics Department, Av. Mickiewicza 30, 30-059 Krakow, Poland
  • 6HASYLAB, DESY, D-22607 Hamburg, Germany

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Issue

Vol. 88, Iss. 3 — 15 July 2013

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