On 15/11/2020 21:26, Paolo Giannozzi wrote:
CASTEP uses norm-conserving pseudopotentials only, if I remember
correctly, so the cutoff on the charge density (ecutrho) can be set to
ecutrho=4*ecutwfc.
Not very improtant for QE, but for the record they have ultrasoft -
Chris Pickard coded those in the late '90s, and they are the default:
http://www.castep.org/CASTEP/FAQPseudopotentials
nicola
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