[Pw_forum] Query regarding real space interatomic force constant

2011-07-01 Thread Stefano Baroni
Dear Sandeep, sure it can, if you take all the periodic replica of any atom into account (as one should). SB On Jun 30, 2011, at 7:28 PM, Sandeep Kumar wrote: > Dear PWSCF users, > I have carried out linear response phonon calculations for Al over a 4 * 4 * > 4 grid of q-points. This correspo

[Pw_forum] Query regarding real space interatomic force constant

2011-06-30 Thread Sandeep Kumar
Dear PWSCF users, I have carried out linear response phonon calculations for Al over a 4 * 4 * 4 grid of q-points. This corresponds to a calculation in a supercell comprised of 4 * 4* 4 unit cells (primitive). We recall that the lattice vectors in fractional coordinate system of a fcc primitive