Electrically and magnetically induced optical rotation in Pb5Ge3O11:Cr crystals at the phase transition. 1. Electrogyration effect in Pb5Ge3O11:Cr

TL;DR

This study investigates the temperature-dependent electrogyration and natural optical activity in Pb5Ge3O11:Cr crystals, revealing exceptionally high EG coefficients and deriving thermodynamic parameters from optical measurements.

Contribution

It provides new insights into the electrogyration effect in Pb5Ge3O11:Cr crystals and demonstrates how to extract thermodynamic constants from optical data.

Findings

High magnitude of electrogyration coefficient observed

Temperature dependences used to derive thermodynamic parameters

Insights into phase transition behavior in Pb5Ge3O11:Cr

Abstract

We present the results of studies for temperature dependences of electrogyration (EG) effect and natural optical activity in Pb5Ge3O11:Cr crystals. Extremely high magnitude of EG coefficient is found for these crystals. We also demonstrate how the Curie-Weiss constant, the critical exponents of the order parameter and the dielectric permittivity, as well as the coefficients of thermodynamic potential, could be derived from the temperature dependences of optical activity and EG coefficient.