pwtools.thermo.debye_func

pwtools.thermo.debye_func(x, nstep=100, zero=1e-08)

Debye function

$f(x)=3{\int }_0^1{t}^3/[\exp (tx)-1]dt$

Parameters:

• x (float or 1d array)

• nstep (int) – number of points for integration

• zero (float) – approximate the 0 in the integral by this (small!) number