Dear Quantum Espresso Users,

I have been using the hp.x code to calculate the Hubbard-U corrections for 
correlated metallic systems in both their spin-polarised and paramagnetic 
states.

In several materials I have noticed that the Hubbard-U value determined for a 
material in its paramagnetic ground state is approximately twice that compared 
to when a spin-polarised ground state is assumed (with all other parameters 
kept the same).

I was wondering whether anyone had any insight into how the accounting for 
spins in occupied Hubbard states works for the hp.x code and whether the 
paramagnetic implementation of hp.x perhaps counts all spins states twice 
resulting in this larger value.

Thank you in advance,

Theo Weinberger
PhD Student
University of Cambridge
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