Structural instability Antiferromagnetism 1 Binary alloys 1 Calculations 1 Chaotics 1 Copper compounds 1 Energy differences 1 Errors 1 First principle calculations 1 Floquet 1 Hamiltonians 1 Infinite-layer 1 Ising model 1 Local minimums 1 Multi-body interactions 1 Nickel 1 Nickel compounds 1 Nickelates 1 Out of phase 1 Perturbation techniques 1 Phase rotation 1 Phonon frequencies 1 Phonon mode 1 Phonons 1 Quantum chemistry 1 Quantum simulations 1 Rare earth elements 1 Rare earths 1 Small variations 1 Spin systems 1