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`LANGEVIN_GAMMA` and `LANGEVIN_GAMMA_L`

Friction coefficients () for atomic degrees of freedom used in Langevin dynamics
(`MDALGO=3`) are defined via the parameter `LANGEVIN_GAMMA`:

`LANGEVIN_GAMMA=[real array]` friction coefficients (in ps) for each species
defined in `POSCAR`

Default

`LANGEVIN_GAMMA=0.,...,0.`

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

Default

`LANGEVIN_GAMMA_L=0.`

Note that Langevin dynamics with set to zero is equivalent to
deterministic ( in the case of Parrinello-Rahman method) dynamics.

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