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From ultrasoft pseudopotentials to the projector augmented-wave method

1999/01/15 by G. Kresse, Georg Kresse, D. Joubert +1 · 414 citations
Earth and Planetary Sciences · Materials Science · Physics and Astronomy · #Advanced Chemical Physics Studies #Boron and Carbon Nanomaterials Research #High-pressure geophysics and materials

paper · doi:10.1103/physrevb.59.1758

openalex publication_date 1999/01/15 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/31

Abstract

The formal relationship between ultrasoft (US) Vanderbilt-type pseudopotentials and Bl"ochl's projector augmented wave (PAW) method is derived. It is shown that the total energy functional for US pseudopotentials can be obtained by linearization of two terms in a slightly modified PAW total energy functional. The Hamilton operator, the forces, and the stress tensor are derived for this modified PAW functional. A simple way to implement the PAW method in existing plane-wave codes supporting US pseudopotentials is pointed out. In addition, critical tests are presented to compare the accuracy and efficiency of the PAW and the US pseudopotential method with relaxed core all electron methods. These tests include small molecules (H2,H2O,Li2,N2,F2,BF3,SiF4) and several bulk systems (diamond, Si, V, Li, Ca, CaF2, Fe, Co, Ni). Particular attention is paid to the bulk properties and magnetic energies of Fe, Co, and Ni.

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