  The mobility of high-frequency discrete breathers in monatomic chains with
nonlinear interatomic potentials of the nearest neighbours is considered. It
was found that the odd (cubic and fifth) anharmonicity strongly affects the
mobility of breathers, sharply increasing the distance that it propagates
without being trapped. It was also found that the correctly chosen fifth
anharmonicity leads to an inversion of stability between the bond-centred and
site-centers breathers and to the low-radiative propagation of discrete
breathers along the chain.
