  In this study, we present a rutile-related material, LiMoO2, that becomes a
cluster magnet and exhibits a spin singlet formation on a preformed molybdenum
dimer upon cooling. Unlike ordinary cluster magnets, the atomic dyz orbital
robustly survives despite the formation of molecular orbitals, thereby
affecting the magnetic properties of the selected material. Such hybrid cluster
magnets with the characters of molecular and atomic orbitals realize multiple
independent spins on an isolated cluster, leading to an ideal platform to study
the isolated spin dimers physics.
