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

• Type: Article in International Scientific Journal
• Date: 2001

Authors

Amaral, V. S. (Author) Other; Araújo, João Pedro (Author) Other; Lourenço, A. A C S (Author) Other; Tavares, Pedro B. (Author) Other; Pogorelov, Yu G G (Author) FCUP; Sousa, João Bessa (Author) FCUP; Vieira, Joaquim Manuel (Author) Other

Journal

Title: Journal of Magnetism and Magnetic Materials

Vol. 226

Pages: 942-944

ISSN: 0304-8853

Publisher: Elsevier

Indexing

ISI Web of Knowledge - 5 Citations

Scopus - 5 Citations

Other information

Authenticus ID: P-000-VPJ

DOI: 10.1016/s0304-8853(00)00669-7

Abstract (EN): 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.

Language: English

Type (Professor's evaluation): Scientific

No. of pages: 3