Physics – Condensed Matter – Materials Science
Scientific paper
1998-09-17
Europhys. Lett. 47, 90 (1999)
Physics
Condensed Matter
Materials Science
8 pages, 4 figures
Scientific paper
10.1209/epl/i1999-00356-y
Charge-ordered manganites of composition $\rm Pr_{1-x}(Ca_{1-y}Sr_{y})_{x}MnO_3$ exhibit persistent photoconductivity upon exposure to x-rays. This is not always accompanied by a significant increase in the {\it 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 {\it mobility} by lowering or removing these barriers. A mechanism based on magnetic degrees of freedom is proposed.
Casa Diego
Hill John P.
Keimer Bernhard
Kiryukhin V.
Saleh O. A.
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