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Title: Pseudopotentials for quantum Monte Carlo studies of transition metal oxides

Abstract

Quantum Monte Carlo (QMC) calculations of transition metal oxides are partially limited by the availability of high-quality pseudopotentials that are both accurate in QMC and compatible with major plane-wave electronic structure codes. We have generated a set of neon-core pseudopotentials with small cutoff radii for the early transition metal elements Sc to Zn within the local density approximation of density functional theory. The pseudopotentials have been directly tested for accuracy within QMC by calculating the first through fourth ionization potentials of the isolated transition metal (M) atoms and the binding curve of each M-O dimer. We find the ionization potentials to be accurate to 0.16(1) eV, on average, relative to experiment. The equilibrium bond lengths of the dimers are within 0.5(1)% of experimental values, on average, and the binding energies are also typically accurate to 0.18(3) eV. The level of accuracy we find for atoms and dimers is comparable to what has recently been observed for bulk metals and oxides using the same pseudopotentials. Our QMC pseudopotential results compare well with the findings of previous QMC studies and benchmark quantum chemical calculations.

Authors:
 [1];  [1];  [1]
  1. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
Publication Date:
Research Org.:
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States). Oak Ridge Leadership Computing Facility (OLCF)
Sponsoring Org.:
USDOE Office of Science (SC)
OSTI Identifier:
1240526
Alternate Identifier(s):
OSTI ID: 1238706
Grant/Contract Number:  
AC05-00OR22725
Resource Type:
Accepted Manuscript
Journal Name:
Physical Review B
Additional Journal Information:
Journal Volume: 93; Journal Issue: 7; Journal ID: ISSN 2469-9950
Publisher:
American Physical Society (APS)
Country of Publication:
United States
Language:
English
Subject:
73 NUCLEAR PHYSICS AND RADIATION PHYSICS; quantum monte carlo; pseudopotentials

Citation Formats

Krogel, Jaron T., Santana Palacio, Juan A., and Reboredo, Fernando A. Pseudopotentials for quantum Monte Carlo studies of transition metal oxides. United States: N. p., 2016. Web. doi:10.1103/PhysRevB.93.075143.
Krogel, Jaron T., Santana Palacio, Juan A., & Reboredo, Fernando A. Pseudopotentials for quantum Monte Carlo studies of transition metal oxides. United States. doi:10.1103/PhysRevB.93.075143.
Krogel, Jaron T., Santana Palacio, Juan A., and Reboredo, Fernando A. Mon . "Pseudopotentials for quantum Monte Carlo studies of transition metal oxides". United States. doi:10.1103/PhysRevB.93.075143. https://www.osti.gov/servlets/purl/1240526.
@article{osti_1240526,
title = {Pseudopotentials for quantum Monte Carlo studies of transition metal oxides},
author = {Krogel, Jaron T. and Santana Palacio, Juan A. and Reboredo, Fernando A.},
abstractNote = {Quantum Monte Carlo (QMC) calculations of transition metal oxides are partially limited by the availability of high-quality pseudopotentials that are both accurate in QMC and compatible with major plane-wave electronic structure codes. We have generated a set of neon-core pseudopotentials with small cutoff radii for the early transition metal elements Sc to Zn within the local density approximation of density functional theory. The pseudopotentials have been directly tested for accuracy within QMC by calculating the first through fourth ionization potentials of the isolated transition metal (M) atoms and the binding curve of each M-O dimer. We find the ionization potentials to be accurate to 0.16(1) eV, on average, relative to experiment. The equilibrium bond lengths of the dimers are within 0.5(1)% of experimental values, on average, and the binding energies are also typically accurate to 0.18(3) eV. The level of accuracy we find for atoms and dimers is comparable to what has recently been observed for bulk metals and oxides using the same pseudopotentials. Our QMC pseudopotential results compare well with the findings of previous QMC studies and benchmark quantum chemical calculations.},
doi = {10.1103/PhysRevB.93.075143},
journal = {Physical Review B},
number = 7,
volume = 93,
place = {United States},
year = {2016},
month = {2}
}

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