Photo-transport properties of Pb2CrO5 single crystals

We report photo-thermoelectric transport phenomena in Pb2CrO5 single crystals. Without illumination, this material exhibits an insulating behavior characterized by an activation-type temperature variation of the electrical conductivity. The Seebeck coefficient contrastingly shows a crossover from hi...

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Bibliographic Details
Published in:Journal of applied physics 2014-11, Vol.116 (19)
Main Authors: Mondal, P. S., Okazaki, R., Taniguchi, H., Terasaki, I.
Format: Article
Language:English
Subjects:
Applied physics
Coefficient of variation
Crossovers
Electrical resistivity
Flux density
Illumination
Seebeck effect
Single crystals
Transport phenomena
Transport properties
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Summary:We report photo-thermoelectric transport phenomena in Pb2CrO5 single crystals. Without illumination, this material exhibits an insulating behavior characterized by an activation-type temperature variation of the electrical conductivity. The Seebeck coefficient contrastingly shows a crossover from high-temperature insulating to low-temperature metallic behavior, which is attributed to degenerate carriers in a donor level. We have found that under illumination, both the conductivity and the Seebeck coefficient increase in magnitude with increasing photon flux density in the degenerate-conduction regime. This result is difficult to understand within a simple photo-doping effect, which usually leads to a decrease in the Seebeck coefficient under illumination. The observed phenomenon is discussed in terms of a two-carrier contribution to the transport properties.
ISSN:0021-8979
1089-7550
DOI:10.1063/1.4902248