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...
Gespeichert in:
Veröffentlicht in: | Physics of the solid state 2013-11, Vol.55 (11), p.2345 |
---|---|
Hauptverfasser: | , , , , , |
Format: | Artikel |
Sprache: | eng |
Schlagworte: | |
Online-Zugang: | Volltext |
Tags: |
Tag hinzufügen
Keine Tags, Fügen Sie den ersten Tag hinzu!
|
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 |