scholarly journals On the accuracy of the algebraic approximation in electronic structure calculations for the ground states of H32+ and H43+ using basis sets of atom-centred Gaussian-type functions

1992 ◽  
Vol 70 (2) ◽  
pp. 290-295 ◽  
Author(s):  
S Wilson
Keyword(s):  
Electronic Structure ◽  
Ground State ◽  
Electronic Structure Calculations ◽  
Finite Basis ◽  
Polyatomic Molecules ◽  
Basis Sets ◽  
Gaussian Type ◽  
Algebraic Approximation ◽  
Structure Calculations ◽  
Ground State Energies

Sequences of even-tempered basis sets of atom-centered Gaussian-type functions are employed to explore the accuracy that can be achieved for the ground state energies of the H32+ and H43+ species in calculations using finite basis sets. These systems are considered as prototypes for the treatment of polyatomic molecules of arbitrary symmetry within the algebraic approximation. Keywords: algebraic approximation, basis sets, even-tempered, universal.

Magnetic Ground State and Electronic Structure Calculations of PbMnO3 Using DFT

2014 ◽  
Vol 895 ◽  
pp. 420-423 ◽  
Author(s):  
Sathya Sheela Subramanian ◽  
Baskaran Natesan
Keyword(s):  
Electronic Structure ◽  
Band Structure ◽  
Fermi Level ◽  
Ground State ◽  
Density Functional ◽  
Electronic Structure Calculations ◽  
Magnetic Ground State ◽  
Electronic Band ◽  
Structure Calculations ◽  
Centrosymmetric Structure

Structural optimization, magnetic ground state and electronic structure calculations of tetragonal PbMnO3have been carried out using local density approximation (LDA) implementations of density functional theory (DFT). Structural optimizations were done on tetragonal P4mm (non-centrosymmetric) and P4/mmm (centrosymmetric) structures using experimental lattice parameters and our results indicate that P4mm is more stable than P4/mmm. In order to determine the stable magnetic ground state of PbMnO3, total energies for different magnetic configurations such as nonmagnetic (NM), ferromagnetic (FM) and antiferromagnetic (AFM) were computed for both P4mm and P4/mmm structures. The total energy results reveal that the FM non-centrosymmetric structure is found to be the most stable magnetic ground state. The electronic band structure, density of states (DOS) and the electron localization function (ELF) were calculated for the stable FM structure. ELF revealed the distorted non-centrosymmetric structure. The band structure and DOS for the majority spins of FM PbMnO3showed no band gap at the Fermi level. However, a gap opens up at the Fermi level in minority spin channel suggesting that it could be a half-metal and a potential spintronic candidate.

Sign in / Sign up

Export Citation Format

Share Document