Ba3CeRu2O9 with four holes per dimer is in the crossover between Mott and cluster Mott limits, with a spin-orbit entangled singlet ground state that is predominantly Mott-like in charge distribution yet over 70% described by a quasimolecular wave function.
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Between Mott and cluster Mott: spin-orbit entangled dimer singlets in Ba$_3$CeRu$_2$O$_9$
Ba3CeRu2O9 with four holes per dimer is in the crossover between Mott and cluster Mott limits, with a spin-orbit entangled singlet ground state that is predominantly Mott-like in charge distribution yet over 70% described by a quasimolecular wave function.