Metamagnetic transition of CeRh₂ Si₂ under high fields and high pressures at various temperatures

High-field magnetization measurements in a heavy fermion antiferromagnet CeRh₂Si₂ were performed under high pressures at various temperatures to study the nature of the metamagnetism. Metamagnetic transitions were observed not only in the antiferromagnetic state but also in the paramagnetic state at various pressures. The metamagnetism in CeRh₂Si₂ does not originate from the rearrangement of antiferromagnetic moments but from the recovery of the local moment from the Kondo singlet state by applying high magnetic fields.