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Finite-temperature properties of multiferroic BiFeO3

I.A. Kornev 1, 2 S. Lisenkov 2 R. Haumont 3 B. Dkhil 4 L. Bellaiche 2
1 Mads Clausen Institute for Product Innovation
2 Department of Physics Department [Fayetteville]
3 ICMMO - Institut de Chimie Moléculaire et des Matériaux d'Orsay
4 SPMS - Laboratoire Structures, Propriétés et Modélisation des solides
Abstract : An effective Hamiltonian scheme is developed to study finite-temperature properties of multiferroic BiFeO3. This approach reproduces very well (i)the symmetry of the ground state, (ii)the Néel and Curie temperatures, and (iii)the intrinsic magnetoelectric coefficients (that are very weak). This scheme also predicts (a)an overlooked phase above TC 1100K that is associated with antiferrodistortive motions, as consistent with our additional x-ray diffractions, (b)improperlike dielectric features above TC, and (c)that the ferroelectric transition is of first order with no group-subgroup relation between the paraelectric and polar phases. © 2007 The American Physical Society.
Keywords : Magnetoelectric coefficients Finite-temperature properties Ferroelectric materials Ground state Hamiltonians Thermal effects X ray diffraction Dielectric features Ferroelectric transitions Bismuth compounds
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https://hal-centralesupelec.archives-ouvertes.fr/hal-02269773
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Submitted on : Friday, August 23, 2019 - 11:34:28 AM
Last modification on : Wednesday, September 16, 2020 - 5:14:46 PM

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CENTRALESUPELEC | SPMS | CNRS | INC-CNRS | EC-PARIS | SPMS-AXE2

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I.A. Kornev, S. Lisenkov, R. Haumont, B. Dkhil, L. Bellaiche. Finite-temperature properties of multiferroic BiFeO3. Physical Review Letters, American Physical Society, 2007, 99 (22), pp.227602. ⟨10.1103/PhysRevLett.99.227602⟩. ⟨hal-02269773⟩

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