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Title: Influence of the lanthanum deficit on electrical resistivity and heat capacity of silver-doped lanthanum manganites La{sub 1-x}Ag{sub y}MnO{sub 3}

Abstract

The electrical resistivity and heat capacity of the silver-doped lanthanum manganites La{sub 0.80}Ag{sub 0.15}MnO{sub 3} and La{sub 0.85}Ag{sub 0.15}MnO{sub 3} have been investigated. Despite the nonstoichiometry of the composition, the La{sub 0.80}Ag{sub 0.15}MnO{sub 3} manganite exhibits a bulk homogeneity and better physical properties from the applied point of view as compared to the La{sub 0.85}Ag{sub 0.15}MnO{sub 3} manganite, viz., the former compound has a higher spontaneous magnetoresistance and a larger jump of the heat capacity with a small width of the phase transition, and the anomalies of the heat capacity and electrical resistivity in the vicinity of the Curie point of this compound agree with the fluctuation nature of the second-order phase transition. The behavior of the properties of lanthanum-deficient manganites under investigation in the region of the phase transition is consistent with the classical theory of indirect exchange interaction. The behavior of the temperature dependence of the electrical resistivity has been analyzed in terms of two models. One of these models is based on the tunneling of charge carriers between ferrons or polarons, and the other model is based on the polaron hopping conduction. Both approaches lead to consistent results, and their combination has made it possible to estimatemore » the tunneling distance of charge carriers. The origin of the influence of technological parameters characterizing the synthesis of La{sub 1-x}Ag{sub y}MnO{sub 3} ceramic materials on their physical properties has been elucidated.« less

Authors:
 [1]; ;  [2]
  1. Russian Academy of Sciences, Amirkhanov Institute of Physics, Dagestan Scientific Center (Russian Federation)
  2. Moscow State University (Russian Federation)
Publication Date:
OSTI Identifier:
21443642
Resource Type:
Journal Article
Journal Name:
Journal of Experimental and Theoretical Physics
Additional Journal Information:
Journal Volume: 109; Journal Issue: 6; Other Information: DOI: 10.1134/S1063776109120103; Copyright (c) 2009 Pleiades Publishing, Ltd.; Journal ID: ISSN 1063-7761
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; 75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; CERAMICS; CHARGE CARRIERS; CURIE POINT; DOPED MATERIALS; EXCHANGE INTERACTIONS; FLUCTUATIONS; LANTHANUM COMPOUNDS; MAGNETORESISTANCE; MANGANATES; PHASE TRANSFORMATIONS; POLARONS; SILVER ADDITIONS; SILVER COMPOUNDS; SPECIFIC HEAT; TEMPERATURE DEPENDENCE; TUNNEL EFFECT; ALLOYS; ELECTRIC CONDUCTIVITY; ELECTRICAL PROPERTIES; INTERACTIONS; MANGANESE COMPOUNDS; MATERIALS; OXYGEN COMPOUNDS; PHYSICAL PROPERTIES; QUASI PARTICLES; RARE EARTH COMPOUNDS; SILVER ALLOYS; THERMODYNAMIC PROPERTIES; TRANSITION ELEMENT ALLOYS; TRANSITION ELEMENT COMPOUNDS; TRANSITION TEMPERATURE; VARIATIONS

Citation Formats

Abdulvagidov, Sh. B., E-mail: abdulvagidov@iwt.ru, Gamzatov, A G, Mel'nikov, O V, and Gorbenko, O Yu. Influence of the lanthanum deficit on electrical resistivity and heat capacity of silver-doped lanthanum manganites La{sub 1-x}Ag{sub y}MnO{sub 3}. United States: N. p., 2009. Web. doi:10.1134/S1063776109120103.
Abdulvagidov, Sh. B., E-mail: abdulvagidov@iwt.ru, Gamzatov, A G, Mel'nikov, O V, & Gorbenko, O Yu. Influence of the lanthanum deficit on electrical resistivity and heat capacity of silver-doped lanthanum manganites La{sub 1-x}Ag{sub y}MnO{sub 3}. United States. https://doi.org/10.1134/S1063776109120103
Abdulvagidov, Sh. B., E-mail: abdulvagidov@iwt.ru, Gamzatov, A G, Mel'nikov, O V, and Gorbenko, O Yu. Tue . "Influence of the lanthanum deficit on electrical resistivity and heat capacity of silver-doped lanthanum manganites La{sub 1-x}Ag{sub y}MnO{sub 3}". United States. https://doi.org/10.1134/S1063776109120103.
@article{osti_21443642,
title = {Influence of the lanthanum deficit on electrical resistivity and heat capacity of silver-doped lanthanum manganites La{sub 1-x}Ag{sub y}MnO{sub 3}},
author = {Abdulvagidov, Sh. B., E-mail: abdulvagidov@iwt.ru and Gamzatov, A G and Mel'nikov, O V and Gorbenko, O Yu},
abstractNote = {The electrical resistivity and heat capacity of the silver-doped lanthanum manganites La{sub 0.80}Ag{sub 0.15}MnO{sub 3} and La{sub 0.85}Ag{sub 0.15}MnO{sub 3} have been investigated. Despite the nonstoichiometry of the composition, the La{sub 0.80}Ag{sub 0.15}MnO{sub 3} manganite exhibits a bulk homogeneity and better physical properties from the applied point of view as compared to the La{sub 0.85}Ag{sub 0.15}MnO{sub 3} manganite, viz., the former compound has a higher spontaneous magnetoresistance and a larger jump of the heat capacity with a small width of the phase transition, and the anomalies of the heat capacity and electrical resistivity in the vicinity of the Curie point of this compound agree with the fluctuation nature of the second-order phase transition. The behavior of the properties of lanthanum-deficient manganites under investigation in the region of the phase transition is consistent with the classical theory of indirect exchange interaction. The behavior of the temperature dependence of the electrical resistivity has been analyzed in terms of two models. One of these models is based on the tunneling of charge carriers between ferrons or polarons, and the other model is based on the polaron hopping conduction. Both approaches lead to consistent results, and their combination has made it possible to estimate the tunneling distance of charge carriers. The origin of the influence of technological parameters characterizing the synthesis of La{sub 1-x}Ag{sub y}MnO{sub 3} ceramic materials on their physical properties has been elucidated.},
doi = {10.1134/S1063776109120103},
url = {https://www.osti.gov/biblio/21443642}, journal = {Journal of Experimental and Theoretical Physics},
issn = {1063-7761},
number = 6,
volume = 109,
place = {United States},
year = {2009},
month = {12}
}