Berlin 2018 – wissenschaftliches Programm

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KFM: Fachverband Kristalline Festkörper und deren Mikrostruktur

KFM 25: Ferroics and Multiferroics (joint session KFM/TT/MA)

KFM 25.7: Vortrag

Donnerstag, 15. März 2018, 11:50–12:10, EMH 225

Pressure-induced insulator-metal transition in EuMnO₃ — •Andres Cano — CNRS, Univ. Bordeaux, ICMCB, Bordeaux, France

We study the influence of external pressure on the electronic and magnetic structure of EuMnO₃ from first-principles calculations. We find a pressure-induced insulator? metal transition at which the magnetic order changes from A-type antiferromagnetic to ferromagnetic with a strong interplay with Jahn?Teller distortions. This unexpected pressure-induced insulator-to-metal transition, although similar to the observed in CMR LaMnO₃, is unprecedented within the multiferroic RMnO₃ series. In addition, we find that the non-centrosymmetric E^?-type antiferromagnetic order can become nearly degenerate with the ferromagnetic ground state in the high-pressure metallic state. These features make EuMnO₃ an unique compound among the manganites because it behaves differently with respect to physical and “chemical” pressure, and hosts a genuinely new type of ferroelectric-like metallic state.

[1] Pressure-induced insulator-metal transition in EuMnO3, R. Qiu, E. Bousquet and A. Cano, J. Phys.: Condens. Matter 29, 305801 (2017).