Normal heat conductivity of the one-dimensional lattice with periodic potential of nearest-neighbor interaction

The process of heat conduction in a chain with a periodic potential of near est-neighbor interaction is investigated by means of molecular dynamics sim ulation. It is demonstrated that the periodic potential of nearest-neighbor interaction allows one to obtain normal heat conductivity in an isolated o ne-dimensional chain with conserved momentum. The system exhibits a transit ion from infinite to normal heat conductivity with the growth of its temper ature. The physical reason for normal heat conductivity is the excitation o f high-frequency stationary localized rotational modes. These modes absorb the momentum and facilitate locking of the heat flux.