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Friction coefficients () for atomic degrees of freedom used in Langevin dynamics
(MDALGO=3) are defined via the parameter LANGEVIN_GAMMA:
LANGEVIN_GAMMA and LANGEVIN_GAMMA_L
LANGEVIN_GAMMA=[real array] friction coefficients (in ps) for each species
defined in POSCAR
In addition to for atomic degrees of freedom, also
the friction coefficient for lattice degrees of freedom has to be defined
in the case of Parrinello-Rahman dynamics [79,80] (see 6.62.6):
LANGEVIN_GAMMA_L=[real] friction coefficients (in ps) for lattice
degrees of freedom
Note that Langevin dynamics with set to zero is equivalent to
deterministic ( in the case of Parrinello-Rahman method) dynamics.
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