Neutron scattering study of magnetic excitation in spinel structure spin-orbital coupling compound CuGa2O4

We report neutron scattering measurements on a single crystal CuGa2O4 sample. The spinel structure of CuGa2O4 can cause strong spin-orbit coupling in this compound. From DC susceptibility and elastic neutron measurements, we found no sign of long- or short-range magnetic order down to 0.1K. Measurements on low energy magnetic excitations show ring shape intensity distribution in momentum space from this sample at low temperature. With increasing temperature, the magnetic excitation intensity gradually goes away.