Pressure induced phase transition in PbSnTe

Abstract Hall coefficient R H and resistivity ϱ for Pb 0.56 Sn 0.44 Te crystal were measured as a function of temperature and pressure in the region of the ferroelectric phase transition. It enabled to obtain the pressure dependence of the phase transition temperature. Analysis of the experimental data showed that the lattice anharmonicity gives the dominant contribution to the phase transition mechanism.