Discovery of a spin-singlet ground state with an energy gap inCaCuGe2O6

Abstract
The magnetic properties of CaCuGe2 O6, a cuprate related to the spin-Peierls material CuGeO3, were studied. The magnetic susceptibility and the magnetization curve were measured. They revealed that this compound has a spin-singlet ground state and a finite energy gap between the ground and excited states. We discuss the origin of such a property of CaCuGe2 O6.