Abstract
In this article, we introduce our recent high-pressure study on magnetism and multiferroicity in olivine-type Mn2GeO4. This compound shows successive magnetic transitions at ambient pressure and a ferroelectric ground state driven by spin-spiral order, i.e., a multiferroic state. The multiferroicity under high pressure was taken by using a recently constructed measurement system equipped with a diamond anvil cell. The pressure evolution of the magnetic structures was investigated with powder and single-crystal neutron scattering experiments using a Paris-Edinburgh press. We found that the ferroelectricity in the lowest-temperature phase disappears at 6 GPa where an incommensurate-commensurate magnetic phase transition is observed. The origin of the pressure-induced transition is discussed. Some details of the high-pressure experimental techniques will be also presented.
