The perovskite oxide [Formula presented] has been found to switch its electronic ground state drastically at 23 GPa through measurements of [Formula presented] Mössbauer spectroscopy and powder x-ray diffraction up to 56 GPa. In the low-pressure region a first-order transition from a charge-uniform paramagnetic metallic phase to a charge-disproportionated [Formula presented] antiferromagnetic insulating phase occurs at 207 K at 0.1 MPa and 165 K at 21 GPa, typically. Above 25 GPa, however, a charge-uniform ferromagnetic (and most probably metallic) phase persists below 300 K. This switching occurs at a lattice volume of [Formula presented].
ASJC Scopus subject areas
- Physics and Astronomy(all)