Thermal and Elastic Properties of Black Phosphorus

Abstract

Temperature dependence of specific heat at constant pressure, and temperature and hydrostatic pressure dependence of elastic constants have been measured on single crystals of black phosphorus. Elastic softening is observed in c₅₅ with decreasing temperature. The elastic constants c₁₁, c₂₂ and c₃₃ increase with pressure up to 6–7 kbar. Deformation potential effect in this system is discussed.