Quantum chemistry 2 Spin models Atomic ions 1 Crystals 1 DFT+ U 1 Density functional theory 1 Density-functional-theory 1 Dft + u 1 Exchange interactions 1 Exchange parameters 1 First principle calculations 1 Ground state 1 Hamiltonians 1 Heisenberg spins 1 Hubbard 1 Intelligent systems 1 Linear strings 1 Magnetic configuration 1 Magnetic materials 1 Magnetic susceptibility 1 Manganese oxide 1 Model Hamiltonians 1 Monolithics 1 Monte Carlo methods 1 Monte Carlo simulation 1 Monte Carlo's simulation 1 Nickel oxide 1 Quantum matter 1 Quantum simulations 1 Radio waves 1