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Hello all,

I'm trying to use linear response in VASP to compute force constants in real space. However, 2 things remain unclear to me.

1) I believe that linear response does not require a supercell approach to obtain force constants, contrary to the frozen phonon method. Is this statement correct?

2) I believe VASP gives the dynamical matrix at the gamma-point in vasprun.xml under the header "hessian". Does anyone know how to get dynamical matrices at other q-vectors from this and how to get force constants?

Thanks,

Maarten

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