Neutron scattering evidence of spin-liquid behavior in spinel compound CuGa2O4

We report neutron scattering measurements on a single crystal of CuGa2O4 sample. DC susceptibility shows no sign of ordering and elastic neutron measurements give no indication of magnetic order down to 0.1K. 3D measurements on low energy magnetic excitations show diffuse continuum intensity distributed about Brillouin zone boundary in momentum space at low temperature. The magnetic excitations extend up to at least 6 meV, and any gap must be smaller than 0.5 meV. With increasing temperature, the low energy magnetic excitation intensity gradually goes away, with a significant intensity reduction by 30 K.