Non-linear conduction in LaCaMnO3 thin films:: Interface tunneling effects

被引：5

作者：

Amaral, VS

Araújo, JP

Lourenço, AACS

Tavares, PB

Pogorelov, YG

Sousa, JB

Vieira, JM

机构：

[1] Univ Aveiro, Dept Fis, P-3810193 Aveiro, Portugal

[2] Univ Porto, Dept Fis, IFIMUP, P-4150 Oporto, Portugal

[3] Univ Aveiro, Dept Eng Ceram & Vidro, P-3810 Aveiro, Portugal

[4] Univ Tras Montes Alto Douro, Seccao Quim, P-5000 Vila Real, Portugal

来源：

JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS | 2001年 / 226卷 / PART I期

关键词：

nonlinear transports; tunneling; magnetoresistance-colossal; exchange coupling-double;

D O I：

10.1016/S0304-8853(00)00669-7

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

Non-linear resistivity in La0.78Ca0.25MnO3 epitaxial thin films is studied using 2-contact dynamic measurements. Non-linear V-l is obtained below T-c ( similar to 220 K). Evaporated gold or direct silver-paste contacts give similar results. dV/dI at high voltages ( similar to 1 V) follows the usual four-point resistance results, but at lower voltages an additional contribution up to 2 orders of magnitude higher develops at low temperatures. These effects are associated with tunneling processes at the metal/manganite interface. (C) 2001 Elsevier Science B.V. All rights reserved.

引用

页码：942 / 944

页数：3