Meyer-Neldel rule in the conductivity of phase separated manganites

被引：2

作者：

Przybytek, Jacek ^{[1
,2
]}

Markovich, Vladimir ^{[3
]}

Jung, Grzegorz ^{[3
,4
]}

机构：

[1] PAS, Inst High Pressure Phys, PL-01142 Warsaw, Poland

[2] Univ Warsaw, Fac Phys, Inst Expt Phys, PL-02093 Warsaw, Poland

[3] Ben Gurion Univ Negev, Dept Phys, IL-84105 Beer Sheva, Israel

[4] PAS, Inst Phys, PL-02668 Warsaw, Poland

来源：

JOURNAL OF ELECTRICAL ENGINEERING-ELEKTROTECHNICKY CASOPIS | 2019年 / 70卷 / 07期

关键词：

manganites; Meyer-Neldel rule; activation energy; metastable resistivity;

D O I：

10.2478/jee-2019-0043

中图分类号：

TM [电工技术]; TN [电子技术、通信技术];

学科分类号：

0808 ; 0809 ;

摘要：

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.

引用

页码：65 / 70

页数：6

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