Between Mott and cluster Mott: spin-orbit entangled dimer singlets in Ba${}_3$CeRu${}_2$O${}_9$

L. Pätzold, A. Sandberg, H. Schilling +8

The hexagonal 4d ruthenates Ba3MRu2O9 host structural dimers and exhibit a delicate balance of competing interactions. Hund's coupling, trigonal crystal-field splitting, and hoppin…