Volume 47, Number 1, July 1999
|Page(s)||90 - 96|
|Section||Condensed matter: electronic structure, electrical, magnetic and optical properties|
|Published online||01 September 2002|
Persistent X-ray photoconductivity and percolation of metallic clusters in charge-ordered manganites
Department of Physics, Princeton University, Princeton - NJ 08544, USA
2 Max-Planck-Institut für Festkörperforschung - D-70569 Stuttgart, Germany
3 Department of Physics, Brookhaven National Laboratory - Upton, NY 11973, USA
4 Joint Research Center for Atom Technology (JRCAT), Tsukuba - Ibaraki 305, Japan
5 Department of Applied Physics, University of Tokyo - Tokyo 113, Japan
Accepted: 23 April 1999
Charge-ordered manganites of composition exhibit persistent photoconductivity upon exposure to X-rays. This is not always accompanied by a significant increase in the number of conduction electrons as predicted by conventional models of persistent photoconductivity. An analysis of the X-ray diffraction patterns and current-voltage characteristics shows that X-ray illumination results in a microscopically phase-separated state in which charge-ordered insulating regions provide barriers against charge transport between metallic clusters. The dominant effect of X-ray illumination is to enhance the electron mobility by lowering or removing these barriers. A mechanism based on magnetic degrees of freedom is proposed.
PACS: 72.40.+w – Photoconduction and photovoltaic effects / 71.30.+h – Metal-insulator transitions and other electronic transitions / 72.80.Ga – Transition-metal compounds
© EDP Sciences, 1999
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