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Molecular spin-orbit excitations in the<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:msub><mml:mi>J</mml:mi><mml:mi>eff</mml:mi></mml:msub></mml:math>=<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mfrac><mml:mn>1</mml:mn><mml:mn>2</mml:mn></mml:mfrac></mml:math>frustrated spinel GeCo<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:msub><mml:mrow /><mml:mn>2</mml:mn></mml:msub></mml:math>O<mml:math …
We describe powder and single-crystal inelastic neutron scattering experiments on a spinel-type antiferromagnet GeCo${}_{2}$O${}_{4}$, represented by an effective total angular momentum ${J}_{\mathrm{eff}}=1/2$. Several types of nondispersive short-range magnetic excitations were discovered. The scattering intensity maps in $\mathbit{Q}$ space are well reproduced by dynamical structure factor analyses using molecular model Hamiltonians. …