<abstract xmlns="http://www.w3.org/1999/xhtml">Meyer-Neldel behaviour of the conductivity of phase separated La1−xCaxMnO3 manganite system in the low Ca-doping range has been investigated. Evolution of the isokinetic temperature of the conductivity, modified by Ca-doping, hydrostatic pressure and current bias has been determined. In addition, the evolution of the isokinetic temperature with ageing has also been studied. It is found that the Meyer-Neldel behaviour of the manganite system stems from multi-excitation entropy mechanism. The isokinetic temperatures estimated from pressure and doping effects coincide but differ from those determined using current and ageing controlled conductivity changes. It is concluded that in the presence of a detailed theoretical model of the excitations coupling in manganites, the investigations of the Meyer-Neldel effect may became a powerful tool for characterization and investigation of transport mechanisms in phase separated manganites.</abstract>

Meyer-Neldel behaviour of the conductivity of phase separated La1−xCaxMnO3 manganite system in the low Ca-doping range has been investigated. Evolution of the isokinetic temperature of the conductivity, modified by Ca-doping, hydrostatic pressure and current bias has been determined. In addition, the evolution of the isokinetic temperature with ageing has also been studied. It is found that the Meyer-Neldel behaviour of the manganite system stems from multi-excitation entropy mechanism. The isokinetic temperatures estimated from pressure and doping effects coincide but differ from those determined using current and ageing controlled conductivity changes. It is concluded that in the presence of a detailed theoretical model of the excitations coupling in manganites, the investigations of the Meyer-Neldel effect may became a powerful tool for characterization and investigation of transport mechanisms in phase separated manganites.

Meyer-Neldel rule in the conductivity of phase separated manganites

Institute of Experimental Physics, Faculty of Physics

Journal of Electrical Engineering

This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 License.

{"article-title":"Meyer-Neldel rule in the conductivity of phase separated manganites"}

Meyer-Neldel behaviour of the conductivity of phase separated La1−xCaxMnO3 manganite system in the low Ca-doping range has been investigated. Evolution of the...

Meyer-Neldel rule in the conductivity of phase separated manganites

Publié en ligne: 28 sept. 2019

Pages: 65 - 70

Reçu: 19 mars 2019

DOI: https://doi.org/10.2478/jee-2019-0043

Mots clés
manganites, Meyer-Neldel rule, activation energy, metastable resistivity

© 2019 Jacek Przybytek et al., published by Sciendo

This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 License.

Meyer-Neldel rule in the conductivity of phase separated manganites

Publié en ligne: 28 sept. 2019

Pages: 65 - 70

Reçu: 19 mars 2019

DOI: https://doi.org/10.2478/jee-2019-0043

Mots clésmanganites, Meyer-Neldel rule, activation energy, metastable resistivity

© 2019 Jacek Przybytek et al., published by Sciendo

This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 License.

Mots clés
manganites, Meyer-Neldel rule, activation energy, metastable resistivity