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Multiferroicity in vanadium-doped La2Ti2O7: insights from first principles

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Abstract

We explore an unconventional route in the search for multiferroicity investigating the magnetic doping of La2Ti2O7 (LTO), a ferroelectric layered perovskite, by density functional calculations. We find that substitution of Ti (in the 3d 0 configuration) by V (3d 1) produces: (i) robust ferromagnetic (FM) order, achieving multiferroicity; (ii) structural and magnetic anisotropy, as the dopants cluster in magnetic chains. Moreover, the FM V-chains possess antiferro orbital ordering. We show that the origin of the strong FM coupling lies in the fruitful host-dopant combination: the layered structure of the host prewires the orbitals t 2g with d xy and d xz lower in energy, the V dopants provide the full occupancy of the bonding levels. We further address the stability of chains vs. temperature and the role of oxygen vacancies in undoped as well as Sc-doped and V-doped LTO.

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Correspondence to Marco Scarrozza.

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Contribution to the Topical Issue “New Trends in Magnetism and Magnetic Materials”, edited by Francesca Casoli, Massimo Solzi and Paola Tiberto.

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Scarrozza, M., Filippetti, A. & Fiorentini, V. Multiferroicity in vanadium-doped La2Ti2O7: insights from first principles. Eur. Phys. J. B 86, 128 (2013). https://doi.org/10.1140/epjb/e2013-30672-8

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  • DOI: https://doi.org/10.1140/epjb/e2013-30672-8

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