Correlation consistent effective core potentials for late 3d transition metals adapted for plane wave calculations.

Area of Science:

• Computational Chemistry
• Materials Science
• Quantum Mechanics

Background:

• Accurate electronic structure calculations are crucial for understanding chemical and physical properties.
• Effective core potentials (ECPs) simplify calculations by replacing core electrons, but often require high energy cut-offs.
• Plane wave basis sets are efficient for large systems but demand optimized ECPs for computational feasibility.

Purpose of the Study:

• To develop a modified set of correlation consistent effective core potentials (ccECPs) for late 3d transition metals (Cr-Zn).
• To adapt these potentials for enhanced efficiency in plane wave calculations by enabling lower energy cut-offs.
• To maintain high accuracy comparable to original ccECPs while improving computational performance.

Main Methods:

• Construction of new correlation consistent effective core potentials (ccECPs) for Cr-Zn, termed ccECP-soft.
• Adaptation of potentials for use with Ne-core configurations.
• Benchmarking using atomic spectra and molecular property calculations.

Main Results:

• The new ccECP-soft potentials allow for energy cut-offs at or below approximately 400 Ry.
• Calculations demonstrate that the accuracy of ccECP-soft is comparable to the original ccECPs.
• These modified potentials make large-scale calculations involving transition metals feasible for plane wave codes.

Conclusions:

• The developed ccECP-soft potentials offer a significant improvement in computational efficiency for plane wave methods.
• They provide a balance between accuracy and speed, facilitating studies of complex systems containing late 3d transition metals.
• This advancement opens possibilities for more extensive theoretical investigations in materials science and chemistry.