Nonlinear Frenkel and Poole effects

• Published in: Philosophical magazine. B, Physics of condensed matter. Structural, electronic, optical, and magnetic properties. Vol. 79; no. 2; pp. 331 - 342
• Main Author: Koľdyaev, V. I.
• Format: Journal Article
• Language: English
• Published: Taylor & Francis Group 01.02.1999
• ISSN: 1364-2812; 1463-6417
• DOI: 10.1080/13642819908206802

The constant of the Frenkel effect is shown to be dependent on the electric field when the coulombic centre potentials are overlapping for a certain density range. This dependence is such that the Frenkel constant asymptotically approaches the constant for a single centre as the electric field increases or the density of the centres decreases. In increasing the density of the centres, the nonlinear Frenkel effect changes into the nonlinear Poole effect, which in turn asymptotically converts into the linear effect. Tn the last case for the larger electric field this conversion occurs for higher density of the centres. An interpretation of the effect features in terms of the percolation theory is discussed. The experimental data confirming these effects are considered for an example of a high-electric field conductivity of silicon nitride layers.