RESISTANCE CHANGE OF COBALT AND NIOBIUM FILMS WHEN EXPOSED TO HYDROGEN AND CARBON-MONOXIDE

Authors
CABRERA AL GARRIDOMOLINA W COLINO J LEDERMAN D SCHULLER IK
Citation
Al. Cabrera et al., RESISTANCE CHANGE OF COBALT AND NIOBIUM FILMS WHEN EXPOSED TO HYDROGEN AND CARBON-MONOXIDE, Physical review. B, Condensed matter, 55(20), 1997, pp. 13999-14004
Citations number
44
Categorie Soggetti
Physics, Condensed Matter
Journal title
Physical review. B, Condensed matter → ACNP
ISSN journal
01631829
Volume
55
Issue
20
Year of publication
1997
Pages
13999 - 14004
Database
ISI
SICI code
0163-1829(1997)55:20<13999:RCOCAN>2.0.ZU;2-U
Abstract
The resistance of thin cobalt and niobium films was monitored during 1 000 s exposures to hydrogen or carbon monoxide at a fixed pressure (10 (-6) torr) and also during their removal. Upon an adsorption-desorptio n cycle the resistivity changed in a ''sawtooth'' fashion, similar to the changes previously observed in niobium foils. The resistivity incr ease by the adsorbed gas seems to be directly related to weakly adsorb ed states on the surface. The magnitude of the resistivity changes due to gas adsorption is related to the surface roughness of the film.