V. R. Galakhov, B. A. Gizhevskii, L. V. Elohina, N. N. Loshkareva, S. V. Naumov, M. Raekers, M. Neumann, A. M. Balbashov, “Charge state of manganese ions and the nonstoichiometry of Ca1 − xLayMnO3 − δ single crystals”, Pis'ma v Zh. Èksper. Teoret. Fiz., 2010, Volume 91, Issue 3,Pages 140

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CONDENSED MATTER

Charge state of manganese ions and the nonstoichiometry of Ca_{1 − x}La_yMnO_{3 − δ} single crystals

V. R. Galakhov^a, B. A. Gizhevskii^a, L. V. Elohina^a, N. N. Loshkareva^a, S. V. Naumov^a, M. Raekers^b, M. Neumann^b, A. M. Balbashov^c

^a Institute of Metal Physics, Ural Division of the Russian Academy of Sciences
^b Osnabrueck University
^c Moscow Power Engineering Institute (Technical University)

Abstract: The charge states and effective spins of manganese ions in nonstoichiometric single crystals of Ca_{1 − x}La_yMnO_{3 − δ} (x = 0, 0.05, 1) manganites have been determined from the exchange splitting of Mn 3s X-ray photoelectron spectra. The chemical composition of the manganite samples under investigation, including the concentration of oxygen, has been determined using the data of the X-ray microanalysis of cations. It has been found that the manganite single crystals under investigation have large defectiveness in both the cation and oxygen sublattices. The efficiency of the complex use of 3s photoelectron spectroscopy and X-ray microanalysis in the determination of the charge state of manganese ions and violations of stoichiometry in doped and defected manganites has been demonstrated.

Received: 23.12.2009