Anharmonicity of Cu-based shape-memory alloys in the vicinity of their martensitic transition

Abstract

The anharmonicity in solid crystals due to the nonlinearity of interatomic forces with respect to atomic displacements, is the origin of many important thermodynamic properties of crystals such as the thermal expansion or the deviation of the lattice specific heat at high temperatures with respect to Debye contribution. Moreover, the anharmonic nature of lattice vibrations in crystals plays an essential role in determining the lattice dynamics in the vicinity of structural phase transitions...