Magnetic Structure of LaCrO3 Perovskite under High Pressure from In Situ Neutron Diffraction

The temperature-pressure phase diagram for both the crystal and magnetic structures of LaCrO3 perovskite has been mapped out by in situ neutron-diffraction experiments under pressure. The system offers the opportunity to study the evolution of magnetic order, spin direction, and magnetic moment on crossing the orthorhombic-rhombohedral phase boundary. Moreover, a microscopic model of the super-exchange interaction has been developed on the basis of the crystal structure obtained in this work to account for the behavior of T-N under high pressure.