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Title: Kinetic effects in manganites La{sub 1-x}Ag{sub y}MnO{sub 3} (y {<=} x)

Abstract

We have measured the resistivity, magnetoresistance, and thermopower of ceramic manganite samples La{sub 1-x}Ag{sub y}MnO{sub 3} (y {<=} x) doped with silver as functions of temperature (4.2-350 K) and magnetic field (up to 26 kOe). A metal-insulator phase transition is observed in all investigated samples at temperatures close to room temperature. The behavior of the resistivity and thermopower in the high-temperature paramagnetic region is interpreted using the concept of small radius polaron; the activation energy decreases with increasing doping level. The resistivity in the low-temperature ferromagnetic region is approximated by the expression {rho}{sub FM}(T) = {rho}{sub 0} + AT{sup 2} + BT{sup 4.5} presuming the existence of electron-electron and electron-magnon interactions. A resistivity minimum and a strong magnetoresistive effect are observed at low temperatures. The latter effect is associated with scattering of charge carriers at grain boundaries, which are antiferromagnetically ordered relative to one another. The temperature dependence of thermopower in the magnetically ordered phase is described in the framework of a model taking into account the drag of charge carriers by magnons.

Authors:
; ; ;  [1]; ; ;  [2]
  1. Russian Academy of Sciences, Institute of Physics, Dagestan Research Center (Russian Federation)
  2. Moscow State University (Russian Federation)
Publication Date:
OSTI Identifier:
21075693
Resource Type:
Journal Article
Journal Name:
Journal of Experimental and Theoretical Physics
Additional Journal Information:
Journal Volume: 105; Journal Issue: 4; Other Information: DOI: 10.1134/S1063776107100111; Copyright (c) 2007 Nauka/Interperiodica; Article Copyright (c) 2007 Pleiades Publishing, Inc; Country of input: International Atomic Energy Agency (IAEA); Journal ID: ISSN 1063-7761
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; ACTIVATION ENERGY; CERAMICS; CHARGE CARRIERS; DOPED MATERIALS; ELECTRONS; GRAIN BOUNDARIES; LANTHANUM COMPOUNDS; MAGNETIC FIELDS; MAGNETORESISTANCE; MAGNONS; MANGANATES; PARAMAGNETISM; PHASE TRANSFORMATIONS; SILVER; SILVER COMPOUNDS; TEMPERATURE DEPENDENCE; TEMPERATURE RANGE 0000-0013 K; TEMPERATURE RANGE 0013-0065 K; TEMPERATURE RANGE 0065-0273 K; TEMPERATURE RANGE 0273-0400 K

Citation Formats

Kamilov, I K, Gamzatov, A. G., E-mail: gamzatov_a@mail.dgu.ri, Aliev, A M, Batdalov, A B, Abdulvagidov, Sh B, Mel'nikov, O V, Gorbenko, O Yu, and Kaul', A R. Kinetic effects in manganites La{sub 1-x}Ag{sub y}MnO{sub 3} (y {<=} x). United States: N. p., 2007. Web. doi:10.1134/S1063776107100111.
Kamilov, I K, Gamzatov, A. G., E-mail: gamzatov_a@mail.dgu.ri, Aliev, A M, Batdalov, A B, Abdulvagidov, Sh B, Mel'nikov, O V, Gorbenko, O Yu, & Kaul', A R. Kinetic effects in manganites La{sub 1-x}Ag{sub y}MnO{sub 3} (y {<=} x). United States. doi:10.1134/S1063776107100111.
Kamilov, I K, Gamzatov, A. G., E-mail: gamzatov_a@mail.dgu.ri, Aliev, A M, Batdalov, A B, Abdulvagidov, Sh B, Mel'nikov, O V, Gorbenko, O Yu, and Kaul', A R. Mon . "Kinetic effects in manganites La{sub 1-x}Ag{sub y}MnO{sub 3} (y {<=} x)". United States. doi:10.1134/S1063776107100111.
@article{osti_21075693,
title = {Kinetic effects in manganites La{sub 1-x}Ag{sub y}MnO{sub 3} (y {<=} x)},
author = {Kamilov, I K and Gamzatov, A. G., E-mail: gamzatov_a@mail.dgu.ri and Aliev, A M and Batdalov, A B and Abdulvagidov, Sh B and Mel'nikov, O V and Gorbenko, O Yu and Kaul', A R},
abstractNote = {We have measured the resistivity, magnetoresistance, and thermopower of ceramic manganite samples La{sub 1-x}Ag{sub y}MnO{sub 3} (y {<=} x) doped with silver as functions of temperature (4.2-350 K) and magnetic field (up to 26 kOe). A metal-insulator phase transition is observed in all investigated samples at temperatures close to room temperature. The behavior of the resistivity and thermopower in the high-temperature paramagnetic region is interpreted using the concept of small radius polaron; the activation energy decreases with increasing doping level. The resistivity in the low-temperature ferromagnetic region is approximated by the expression {rho}{sub FM}(T) = {rho}{sub 0} + AT{sup 2} + BT{sup 4.5} presuming the existence of electron-electron and electron-magnon interactions. A resistivity minimum and a strong magnetoresistive effect are observed at low temperatures. The latter effect is associated with scattering of charge carriers at grain boundaries, which are antiferromagnetically ordered relative to one another. The temperature dependence of thermopower in the magnetically ordered phase is described in the framework of a model taking into account the drag of charge carriers by magnons.},
doi = {10.1134/S1063776107100111},
journal = {Journal of Experimental and Theoretical Physics},
issn = {1063-7761},
number = 4,
volume = 105,
place = {United States},
year = {2007},
month = {10}
}