CARRIER BANDWIDTH PHYSICAL PHENOMENA IN STRONGLY CORRELATED MAGNETIC OXIDES: LESSONS FROM NEUTRON DIFFRACTION AT HIGH PRESSURES

摘要

A review of investigations of high-pressure effects on the crystal and magnetic structure of complex manganese and cobalt oxides R_(1-x)A_xMO_3 (A - rare earth, A - alkaline earth elements) performed by neutron diffraction is presented. A rich variety of magnetic state modifications at high pressure was observed in complex manganese oxides. In cobalt oxides application of high pressure induces spin changes, affecting physical properties. The observed phenomena are discussed in the framework of existing theoretical concepts.