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Structural and magn...
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)
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Pashchenko, V. P. (författare)
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Shemyakov, A. A. (författare)
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Savosta, M. M. (författare)
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visa fler...
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Khartsev, Sergiy (författare)
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Derkachenko, V. N. (författare)
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Prokopenko, V. K. (författare)
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Turchenko, V. A. (författare)
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Pashchenko, A. V. (författare)
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Dyakonov, V. P. (författare)
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Buhanzev, Y. (författare)
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Szymczak, H. (författare)
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- AIP Publishing, 2003
- 2003
- Engelska.
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Ingår i: Low temperature physics (Woodbury, N.Y., Print). - : AIP Publishing. - 1063-777X .- 1090-6517. ; 29:11, s. 910-916
- Relaterad länk:
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https://urn.kb.se/re...
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https://doi.org/10.1...
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Abstract
Ämnesord
Stäng
- 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.
Nyckelord
- electronic phase-separation
- colossal magnetoresistance
- transport-properties
- manganites
- transition
- temperature
- systems
- crystal
- oxides
- size
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Pashchenko, V. P ...
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Shemyakov, A. A.
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Savosta, M. M.
-
Khartsev, Sergiy
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Derkachenko, V. ...
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Prokopenko, V. K ...
-
visa fler...
-
Turchenko, V. A.
-
Pashchenko, A. V ...
-
Dyakonov, V. P.
-
Buhanzev, Y.
-
Szymczak, H.
-
visa färre...
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