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Electronic structure, charge and orbital order and metal-insulator transition in nickelates AIP Conf. Solid atomic hydrogen is one of the simplest systems to undergo a metal-insulator transition. Near the transition, the electronic degrees of freedom become strongly correlated and their description provides a difficult challenge for theoretical methods. As a result, the order and density of the phase transition are still subject to debate. In this work, we use diffusion quantum Monte Carlo todoi:10.1063/1.4935808 pmid:26590549 fatcat:n3zjmtd3pzb3fgfabaoq6tjwwm