Anisotropy of the hole drift mobility in barium titanate

Physical Review B - Condensed Matter and Materials Physics

Volumn 53, Issue 11, 1996, Pages 7094-7098

  Mahgerefteh, Daniel ^a   Kirillov, Dimitri ^a   Cudney, Roger S ^a   Bacher, G David ^a   Pierce, Robert M ^a   Feinberg, Jack ^a  

^a UNIVERSITY OF SOUTHERN CALIFORNIA   (United States)

Author keywords

[No Author keywords available]

Indexed keywords

EID: 0000166097     PISSN: 10980121     EISSN: 1550235X     Source Type: Journal    
DOI: 10.1103/PhysRevB.53.7094     Document Type: Article

References (18)

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10. Here we have assumed that the photorefractive and the bulk dc dielectric constants are the same. However, recent theoretical considerations show that the dielectric constant that appears in the photorefractive grating equations, (Formula presented), is not necessarily the same as the unclamped value, (Formula presented), obtained from an external, uniform dc field measurement. [M. Zgonik, K. Nakagawa and P. Günter, J. Opt. Soc. Am. B 12, 1416 (1995).] For photorefractive grating wave vectors oriented perpendicular to the c axis, the two are expected to be the same; (Formula presented)=(Formula presented). However, for gratings oriented parallel to the c axis the photorefractive dielectric constant is predicted to be nearly midway between the clamped and unclamped values; (Formula presented)∼0.63(Formula presented) at room temperature. This suggests that our electrically measured values of R (shaded region of Fig. 4) should be 63% lower than the holographic ones (at T=20t°C). But our data do not support this; our holographic and electrical values of R are the same to within the uncertainty of our measurements.
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