Meyer-Neldel rule in the conductivity of phase separated manganites-Reference-Cited by-同舟云学术

Meyer-Neldel rule in the conductivity of phase separated manganites

Published:2019-09-28 Issue:7 Volume:70 Page:65-70
ISSN:1339-309X
Container-title:Journal of Electrical Engineering
language:en
Short-container-title:

Author:

Przybytek Jacek¹²,Markovich Vladimir³,Jung Grzegorz³⁴

Affiliation:

1. Institute of High Pressure Physics PAS , 01-142 Warsaw , Poland

2. Institute of Experimental Physics, Faculty of Physics , University of Warsaw , 02-093 Warsaw , Poland

3. Department of Physics , Ben Gurion University of the Negev , 84105 Beer Sheva , Israel

4. Institute of Physics PAS , 02-668 Warsaw , Poland

Abstract

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.

Publisher

Walter de Gruyter GmbH

Link

https://www.sciendo.com/pdf/10.2478/jee-2019-0043

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