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Following to this post, I would like to know how to perform linear response theory for calculation of U Hubbard parameter in VASP?

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This page is a really good resource for doing linear response in VASP.

The general idea is you do a ground state calculation, apply linear response non-self-consistently, then apply it self-consistently. As far as I can tell, there is no good package that will do this for you and its a bit tricky to get working.

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