Evidence of valence bond condensation in the frustrated cluster magnet LiZn$_{2}$Mo$_{3}$O$_{8}$

The reduced molybdenum oxide LiZn$_{2}$Mo$_{3}$O$_{8}$ is a Mott insulating material built of two dimensional layers of magnetic Mo$_{3}$O$_{13}$ triangular clusters, arranged on a triangular lattice. Between these magnetic layers are disordered non-magnetic LiZn$_{2}$ layers. The formal oxidation state and calculations show each molybdenum cluster collectively produces a S$=$1/2 moment. The ``triangle of triangles'' arrangement of magnetic clusters gives rise to exciting frustrated magnetic physics while also preventing Jahn-teller instabilities and site disorder seen in single ion frustrated systems. In addition, the structure allows for facile electronic doping of the magnetic layers. Structural and measured physical properties and ongoing research will be discussed. The evidence discussed indicates the formation of an exotic condensed valence bond state, reminiscent of the long-sought resonating valence bond state.