Percolation conductivity of single-crystal manganite [Pr.sub.1-x][Sr.sub.x]mn[O.sub.3] in the phase-separation state

This paper presents an experimental study of the temperature dependences of the electrical resistivity, thermopower, and magnetoresistance of single-crystal manganite [Pr.sub.1 - x][Sr.sub.x]Mn[O.sub.3] (x = 0.22, 0.24). The results obtained have been analyzed in terms of the theory of hopping elect...

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Veröffentlicht in:Physics of the solid state 2013-11, Vol.55 (11), p.2345
Hauptverfasser: Neifeld, E.A, Ugryumova, N.A, Arkhipov, V.E, Korolev, A.V, Dubinin, S.F, Mukovskii, Ya. M
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Sprache:eng
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Zusammenfassung:This paper presents an experimental study of the temperature dependences of the electrical resistivity, thermopower, and magnetoresistance of single-crystal manganite [Pr.sub.1 - x][Sr.sub.x]Mn[O.sub.3] (x = 0.22, 0.24). The results obtained have been analyzed in terms of the theory of hopping electrical conductivity of manganites in the phase-separation state and the main postulates of percolation theory. In the 2-400-K interval, hopping conductivity with temperature-dependent activation energy has been observed. Near the Curie temperature, the monotonic exponential growth of electrical resistivity with decreasing temperature becomes distorted by formation of finite metallic clusters. For T ≤ 36 K, the conductivity of [Pr.sub.0.8][Sr.sub.0.22]Mn[O.sub.3] follows the Mott law.
ISSN:1063-7834
1090-6460
DOI:10.1134/S1063783413110176