Critical behaviors of photoinduced giant permittivity in potassium tantalate

24 March 2003

journal article
research article
Published by American Physical Society (APS) in Physical Review B

Vol. 67 (10) , 100102
https://doi.org/10.1103/physrevb.67.100102

Abstract

We have demonstrated that a static permittivity of potassium tantalate is dramatically enhanced by band-to-band excitation at low temperatures. A critical behavior has been observed in the relaxation time and the oscillator strength of its Debye-type dispersion. Two models, considering photoinduced mesoscopic clusters formed around excited carriers, can successfully reproduce temperature and carrier-density dependence of the photoinduced effect observed in the experiment.

Keywords

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