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Updated: Jul 12, 2025

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Published on: April 8, 2020
Locality error free effective core potentials for 3d transition metal elements developed for the diffusion Monte
Tom Ichibha1,2, Yutaka Nikaido1, M Chandler Bennett2
1School of Information Science, JAIST, Asahidai 1-1, Nomi, Ishikawa 923-1292, Japan.
Abstract:
Pseudopotential locality errors have hampered the applications of the diffusion Monte Carlo (DMC) method in materials containing transition metals, in particular oxides. We have developed locality error free effective core potentials, pseudo-Hamiltonians, for transition metals ranging from Cr to Zn. We have modified a procedure published by some of us in Bennett et al. [J. Chem. Theory Comput. 18, 828 (2022)]. We carefully optimized our pseudo-Hamiltonians and achieved transferability errors comparable to the best semilocal pseudopotentials used with DMC but without incurring in locality errors. Our pseudo-Hamiltonian set (named OPH23) bears the potential to significantly improve the accuracy of many-body-first-principles calculations in fundamental science research of complex materials involving transition metals.
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