Stress dependence of the thermal conductivity of Cr-doped GaAs

Abstract
Thermal-conductivity measurements under uniaxial stress on GaAs containing Cr3+ show that the ion is very sensitive to both E and T2 strains. This is most unusual for strongly coupled Jahn-Teller ions and supports the existence of orthorhombic wells. The tunneling frequency between them is estimated at 300 GHz.