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Effects of Ga doping on magnetic and ferroelectric properties of multiferroic delafossite CuCrO 2 : Ab initio and Monte Carlo approaches

Abstract : The effects of nonmagnetic impurity doping on magnetic and ferroelectric properties of multiferroic delafossite CuCrO 2 are investigated by means of density functional theory calculations and Monte Carlo simulations. Density functional theory calculations show that replacing up to 30% of Cr 3+ ions by Ga 3+ ones does not significantly affect the remaining Cr-Cr superexchange interactions. Monte Carlo simulations show that CuCr 1−x Ga x O 2 preserves its magnetoelectric properties up to x 0.15 with a spiral ordering, while it becomes disordered at higher fractions. Antiferromagnetic transition shifts towards lower temperatures with increasing x and eventually disappears at x 0.2. Our simulations show that Ga 3+ doping increases the Curie-Weiss temperature of CuCr 1−x Ga x O 2 , which agrees well with experimental observations. Moreover, our results show that the incommensurate ground-state configuration is destabilized by Ga 3+ doping under zero applied field associated with an increase of frustration. Finally, coupling between noncollinear magnetic ordering and electric field is reported for x 0.15 through simulating P-E hysteresis loops, which leads to ferroelectricity in the extended inverse Dzyaloshinskii-Moriya model.
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https://hal-normandie-univ.archives-ouvertes.fr/hal-02106756
Contributor : Ahmed Al Baalbaky <>
Submitted on : Tuesday, April 23, 2019 - 12:14:52 PM
Last modification on : Friday, April 24, 2020 - 10:28:08 AM

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PhysRevB.98.174403.pdf
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Ahmed Albaalbaky, Yaroslav Kvashnin, Renaud Patte, Raymond Frésard, Denis Ledue. Effects of Ga doping on magnetic and ferroelectric properties of multiferroic delafossite CuCrO 2 : Ab initio and Monte Carlo approaches. Physical Review B: Condensed Matter and Materials Physics, American Physical Society, 2018, 98 (17), ⟨10.1103/PhysRevB.98.174403⟩. ⟨hal-02106756⟩

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