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  Pressure-Induced Transition from a Charge-Disproportionated Antiferromagnetic State to a Charge-Uniform Ferromagnetic State in Sr2/3La1/3FeO3



The perovskite oxide Sr2/3La1/3FeO3 has been found to switch its electronic ground state drastically at 23 GPa through measurements of 57Fe Mössbauer spectroscopy up to 56 GPa. In the low-pressure region a first order transition from a charge-uniform paramagnetic metallic phase to a charge-disproportionated (3Fe11/3+2Fe3+ + Fe5+) 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.


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