  The temperature dependence of the solid-liquid interfacial free energy,
{\gamma}, is investigated for Al and Ni at the undercooled temperature regime
based on a recently developed persistent-embryo method. The atomistic
description of the nucleus shape is obtained from molecular dynamics
simulations. The computed {\gamma} shows a linear dependence on the
temperature. The values of {\gamma} extrapolated to the melting temperature
agree well with previous data obtained by the capillary fluctuation method.
Using the temperature dependence of {\gamma}, we estimate the nucleation free
energy barrier in a wide temperature range from the classical nucleation
theory. The obtained data agree very well with the results from the brute-force
molecular dynamics simulations.

Chemical Physics;Soft Condensed Matter