  A first-principles based effective Hamiltonian is used within a molecular
dynamics simulation to study the elastocaloric effect in PbTiO3. It is found
that the transition temperature is a linear function of uniaxial tensile
stress. Negative temperature change is calculated, when the uniaxial tensile
stress is switched off, as a function of initial temperature
Delta-T(T_initial). It is predicted that the formation of domain structures
under uniaxial tensile stress degrades the effectiveness of the elastocaloric
effect.
