On the energy scale involved in the metal to insulator transition of quadruple perovskite EuCu3Fe4O12: infrared spectroscopy and ab-initio calculations
Abstract:Optical measurements were carried out by infrared spectroscopy on AA ′3B4O12 A-site ordered quadruple perovskite EuCu3Fe4O12 (microscopic sample) as function of temperature. At 240 K (=TMI), EuCu3Fe4O12 undergoes a very abrupt metal to insulator transition, a paramagnetic to antiferromagnetic transition and an isostructural transformation with an abrupt large volume expansion. Above TMI, optical conductivity reveals a bad metal behavior and below TMI, an insulating phase with an optical gap of 125 meV is observ… Show more
“…In order to assign the absorption features to electronic transitions, we performed ab-initio calculations [28][29][30][31]. Calculation details are provided in the supplemental material [24].…”
“…In order to assign the absorption features to electronic transitions, we performed ab-initio calculations [28][29][30][31]. Calculation details are provided in the supplemental material [24].…”
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