Electronic phase separation in the hexagonal perovskite Ba3SrMo2O9

Competition between exotic magnetic and electronic ground states underpins the properties of strongly correlated transition metal oxides can result in phase separation (EPS). The 6H-perovskite ${\mathrm{Ba}}_{3}{\mathrm{SrMo}}_{2}{\mathrm{O}}_{9}$ exhibits no order down to 1.6 K EPS is observed at 230 K. state this material contains a complex mixture spin-singlet ${\mathrm{Mo}}_{2}{\mathrm{O}}_{9}$ dimers quasimolecular clusters. Segregation emerges due competition direct Mo--Mo bonding Mo--O--Mo superexchange, comprising an unusual mechanism transition-metal oxides.