Persistent photoconductivity in La0.7CaxBa1-xMnO3 thin films

Authors
Cauro, R Grenet, JC Gilabert, A Medici, MG
Citation
R. Cauro et al., Persistent photoconductivity in La0.7CaxBa1-xMnO3 thin films, INT J MOD B, 13(29-31), 1999, pp. 3786-3791
Citations number
11
Categorie Soggetti
Apllied Physucs/Condensed Matter/Materiales Science
Journal title
INTERNATIONAL JOURNAL OF MODERN PHYSICS B
ISSN journal
02179792 → ACNP
Volume
13
Issue
29-31
Year of publication
1999
Pages
3786 - 3791
Database
ISI
SICI code
0217-9792(199912)13:29-31<3786:PPILTF>2.0.ZU;2-V
Abstract
We report, for the first time, experiments of persistent photoconductivity (PPC) in thin films of manganese perovskites La0.7Ca0.25Ba0.05MnO3 and La0. 7Ca0.2Ba0.1MnO3 showing a persistent decrease of a few percent of the resis tance after illumination with visible light. These persistent photoinduced effects are seen only in a range of low temperatures (< 25 K) well below th e insulator-metal transition at respectively T-c=173 K and T-c=120 K. In th is low temperature range, the transport mechanism is rather of activated ho pping type regime.