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We describe powder and single-crystal inelastic neutron scatteringexperiments on a spinel-type antiferromagnet GeCo$_2$O$_4$, represented by aneffective total angular momentum J_eff = 1/2. Several types of non-dispersiveshort-range magnetic excitations were discovered. The scattering intensity mapsin $\vec{Q}$ space are well reproduced by dynamical structure factor analysesusing molecular model Hamiltonians. The results of analyses strongly suggestthat the molecular excitations below T_N arise from a hidden molecular-singletground state, in which ferromagnetic subunits are antiferromagneticallycoupled. The quasielastic excitations above T_N are interpreted as itsprecursor. A combination of frustration and J_eff = 1/2 might induce thesequantum phenomena.

Molecular spin-orbit excitations in the J_eff = 1/2 frustrated spinel GeCo$_2$O$_4$