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Structural and magnetic inhomogeneity and the NMR of Mn-55 and La-139 in the magnetoresistive ceramics La0.7Ba0.3-xSnxMnO3 -> La0.7-xBa0.3-xMnO3+0.5xLa(2)Sn(2)O(7)
- Pashchenko, V. P. (author)
- Shemyakov, A. A. (author)
- Savosta, M. M. (author)
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- Khartsev, Sergiy (author)
- Derkachenko, V. N. (author)
- Prokopenko, V. K. (author)
- Turchenko, V. A. (author)
- Pashchenko, A. V. (author)
- Dyakonov, V. P. (author)
- Buhanzev, Y. (author)
- Szymczak, H. (author)
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- AIP Publishing, 2003
- 2003
- English.
- In: Low temperature physics (Woodbury, N.Y., Print). - : AIP Publishing. - 1063-777X .- 1090-6517. ; 29:11, s. 910-916
- Journal article (peer-reviewed)
Abstract
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- The effects of substitution of barium by tin on the phase composition, structural imperfection, and properties of lanthanum manganite perovskites La0.7Ba0.3-xSnxMnO3 (X=0, 0.1, 0.15, 0.2, 0.3) are established by comprehensive studies done by x-ray diffraction, resistive, and magnetic (including NMR on Mn-55 and La-139) methods. It is shown that the introduction of Sn leads to the formation of a pyrochloric phase La2Sn2O7, to an increase in the density of lattice defects of the manganese-enriched main lanthanum manganite phase, and to a substantial decrease of the magnetoresistive effect. The smearing of the metal-semiconductor phase transition temperature is explained by an increase in the inhomogeneity and imperfection of the perovskite structure. The low activation energy is confirmed by a high degree of inhomogeneity and imperfection of the crystal lattice of the samples studied. The broad, asymmetric NMR spectra of Mn-55 and La-139 attest to high-frequency electron exchange between Mn3+ and Mn4+ and nonequivalence of the environment of those ions and La3+ due both to heterovalent ions and to vacancies and clusters.
Keyword
- electronic phase-separation
- colossal magnetoresistance
- transport-properties
- manganites
- transition
- temperature
- systems
- crystal
- oxides
- size
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- ref (subject category)
- art (subject category)
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- Turchenko, V. A.
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- Dyakonov, V. P.
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- Szymczak, H.
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