Effect of Pressure on the Electrical Conductivity of p - TlInSe₂ Single Crystals

Abstract

The effect of hydrostatic pressure on the electrical conductivity of p-TlInSe₂ single crystals measured along the tetragonal axis [001] in the range from 0 to 30·10⁸ Pa is studied. It is revealed that the pressure dependence of the electrical conductivity follows the regularity , which holds true for the case of the band gap linear narrowing under pressure. The pressure coefficient of band-gap variation is equal to 1.75·10⁻¹⁰ eV/Pa, which coincides in order of magnitude with the coefficient eV/Pa characterizing the narrowing (widening) of the indirect energy gap under unilateral compression (expansion) of the crystal along [001].

Keywords:

• Hydrostatic pressure
• single crystal
• electrical conductivity
• phase transition
• energy gap