Spin States of Cobalt Ions in the Bulk and on the Surface of LaCoO3 Probed by X-ray Absorption, Emission, and Photoelectron Spectra

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Abstract

We present X-ray photoelectron, Co L2,3">L2,3 and O K X-ray absorption, as well as Co Kβ1,3">Kβ1,3 X-ray emission spectroscopy results of studies of the spin states of trivalent cobalt ions in single-crystal cobaltite LaCoO3. We show that at room temperature, in the bulk of a LaCoO3 single crystal, Co3+ ions are in the low-spin state, while high-spin Co2+, high-spin Co3+, low-spin Co3+, and probably also intermediate-spin Co3+ ions are located on the surface.

About the authors

V. R. Galakhov

Mikheev Institute of Metal Physics, Ural Branch, Russian Academy of Sciences

Email: solin@imp.uran.ru
620108, Yekaterinburg, Russia

M. S. Udintseva

Mikheev Institute of Metal Physics, Ural Branch, Russian Academy of Sciences

Email: galakhov@gmail.com
Yekaterinburg, 620108 Russia

D. A. Smirnov

Dresden University of Technology

Email: galakhov@gmail.com
Dresden, 01062 Germany

A. A. Makarova

Physikalische Chemie Institut f¨ur Chemie und Biochemie Freie Universita¨at Berlin

Email: galakhov@gmail.com
Berlin, 14195 Germany

K. Kyupper

University of Osnabru¨uck

Author for correspondence.
Email: galakhov@gmail.com
Osnabrück, 49076 Germany

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