Off-center impurities in alkali halides: reorientation, electric polarization and binding to F center. V. Temperature-dependent electrostatic polarizabilities

TL;DR

This paper derives formulas for how off-center ions in alkali halides respond electrically at different temperatures, linking their behavior to phonon interactions and exploring potential for future research on dispersive coupling.

Contribution

It provides new expressions for temperature-dependent electrostatic polarizabilities of off-center ions, applicable under various experimental conditions.

Findings

Polarizabilities reduce to phonon-coupled two-level system values at low temperatures.

Expressions are valid under different experimental conditions.

Prospects for studying dispersive coupling are discussed.

Abstract

We derive and discuss expressions for the temperature-dependent electrostatic polarizabilities of off-center ions holding good under various experimental conditions. At low temperatures and electric-field strengths, all of them reasonably reduce to values characteristic of phonon-coupled two-level systems. Prospects for further studies of the dispersive coupling are also considered.