Ferromagnetism and orbital order in a topological ferroelectric

Abstract

We explore via density functional calculations the magnetic doping of a topological ferroelectric as an unconventional route to multiferroicity. Vanadium doping of the layered perovskite La${}_2$Ti${}_2$O${}_7$ largely preserves electric polarization and produces robust ferromagnetic order, hence proper multiferroicity. The marked tendency of dopants to cluster into chains results in an insulating character at generic doping. Ferromagnetism stems from the symmetry breaking of the multi-orbital V system via an unusual "antiferro"-orbital order, and from the host's low-symmetry layered structure.

arXiv comment4 pages, 3 figures; Physical Review Letters 109, in print (2012)

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Cited by in corpus (7)

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• Direct magnetization-polarization coupling in BaCuF${}_4$ fluoride
• A three-order-parameter bistable magnetoelectric multiferroic metal
• High thermoelectric figure of merit and thermopower in layered perovskite oxides
• Multiferroicity in V-doped PbTiO${}_3$
• Vanadium-doped HfO${}_2$, multiferroic uncompromised