Antipolar phase in multiferroic BiFeO<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:msub><mml:mrow /><mml:mn>3</mml:mn></mml:msub></mml:math>at high pressure

Козленко, Д. П.; Belik, Alexei А.; Belushkin, Α. V.; Лукин, Е. В.; Marshall, William G.; Савенко, Б. Н.; Takayama‐Muromachi, E.

doi:10.1103/physrevb.84.094108

Cited by 61 publications

(52 citation statements)

References 34 publications

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“…The classical oxide multiferroic materials demonstrate a general trend towards a suppression of ferroelectricity and/or magnetoelectric coupling under pressure, as experimentally found for BiFeO 3 and hexagonal RMnO 3 [17][18][19] This behavior is in-line with a tendency for a suppression of ferroelectricity in displacement-type ferroelectrics under pressure [20].…”

Section: Introductionsupporting

confidence: 75%

“…The stability of the magnetic order with increasing T N value implies a multiferroic character of high-pressure phases. In contrast, the general trend of the pressure behavior of classical multiferroics is a suppression of ferroelectricity and/or magnetoelectric coupling [17][18][19]. In addition, the displacement-type perovskite ferroelectrics ABO 3 generally exhibit a suppression of the ferroelectricity and a stabilization of the cubic perovskite nonpolar P m3m phase [20].…”

Section: Raman Spectroscopymentioning

confidence: 98%

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Pressure-induced polar phases in relaxor multiferroicPbFe0.5Nb0.5O3<

et al. 2014

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The structural, magnetic, and vibrational properties of PbFe 0.5 Nb 0.5 O 3 relaxor multiferroic have been studied by means of x-ray, neutron powder diffraction, and Raman spectroscopy at pressures up to 30 GPa. Two successive structural phase transitions from the initial R3m polar phase to Cm and Pm monoclinic polar phases were observed at P = 5.5 and 8.5 GPa. Both transitions are associated with anomalies in pressure behavior of several stretching and bending modes of oxygen octahedra as well as Fe/Nb localized vibrational modes. The G-type antiferromagnetic order remains stable upon compression up to 6.4 GPa, assuming possible multiferroic properties of pressure-induced phases. The Néel temperature increases with a pressure coefficient (1/T N )dT N /dP = 0.012 GPa −1 . The observed pressure-induced phenomena in PbFe 0.5 Nb 0.5 O 3 are in drastic contrast with conventional multiferroics, exhibiting a general tendency towards a suppression of polar phases and/or magnetoelectric coupling under pressure.

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Section: Introductionsupporting

confidence: 75%

Section: Raman Spectroscopymentioning

confidence: 98%

Pressure-induced polar phases in relaxor multiferroicPbFe0.5Nb0.5O3<

et al. 2014

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“…To the best of our knowledge, this has not been reported up to now. We first suppose that it belongs to the orthorhombic (Pbam) structure, which has been reported at 3 GPa in BFO [15] The best quality of fit shows that the observed reflections can be alternatively indexed using these two models (Fig. 4), i.e., the weak peak actually comes from the Pbam structure, revealing definitly that two phases co-exist in a certain narrow pressure range of 5-7 GPa.…”

Section: Low-pressure Region: 0-11gpamentioning

confidence: 88%

“…For instance, by using x-ray diffraction (XRD) and far-infrared spectroscopy, Haumont et al [12] found that BFO remains the rhombohedral structure up to 6.2 GPa, then changes to a monoclinic structure with space group C2/m. Nevertheless, in a more recent study, a phase transition from the polar rhombohedral R3c phase to the antipolar orthorhombic Pbam phase with antiferroelectric character of atomic displacements has been revealed at 3 GPa by using neutron powder diffraction [15]. Furthermore, Guennou et al [14] have reported that three different phase transitions of orthorhombic symmetry occur in BFO below 10 GPa, through Raman spectroscopy and XRD measurements.…”

Section: Introductionmentioning

confidence: 99%

Pressure-induced phase transitions of multiferroic BiFeO ₃

张小莉¹,

吴也²,

张倩³

et al. 2013

Chinese Phys. C

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Pressure-induced phase transitions of multiferroic BiFeO 3 have been investigated using synchrotron radiation X-ray diffraction with diamond anvil cell technique at room temperature. Present experimental data clearly show that rhombohedral (R3c) phase of BiFeO 3 first transforms to monoclinic (C2/m) phase at 7 GPa, then to orthorhombic (Pnma) phase at 11 GPa, which is consistent with recent theoretical ab initio calculation. However, we observe another peak at 2θ=7° in the pressure range of 5-7 GPa that has not been reported previously. Further analysis reveals that this reflection peak is attributed to the orthorhombic (Pbam) phase, indicating the coexisting of monoclinic phase with orthorhombic phase in low pressure range. Keywords:BiFeO 1.INTRODUCTIONMultiferroics, which exhibit both ferroelectric and magnetic order in the same phase, have attracted great interests because of these unique properties [1,2]. Especially, the magnetic properties of multiferroics can be modulated by external electric fields and vice versa. Bismuth ferrite, BiFeO 3 (BFO) as a prototype multiferroic material, is perhaps the only compound with both magnetic and ferroelectric at ambient conditions [3,4]. In BFO, the 6s 2 lone pair electrons of Bi 3+ arouse the ferroelectricity until the temperature reaches T C =1100 K [5]. Spiral spin cycloid modulated G-type antiferromagnetic order with a periodicity of 62 nm occurs below the Neel temperature (T N =640K) [5,6]. Due to these promising physical properties, many experimental and theoretical efforts have been devoted to its structural characteristics [7] and the nature of magnetoelectric coupling [8,9]. At ambient conditions, BFO crystallizes in the rhombohedral structure with R3c (Z=161) space group, with c-axis parallel to the diagonals of the perovskite cube [10]. The Fe 3+ ion is coordinated by six oxygen atoms, forming an octahedral FeO 6 . Research of phase transitions under high pressures of BFO has been of long-standing interest [3,7,11,12]. Early literature has reported that no phase transition occurs in BFO until the high pressure reaches up to 70 GPa [13]. In contrast, some studies have demonstrated that BFO has undergone several structural phase transitions during the upstroke process. At high pressure above 10 GPa, Haumont et al.[12] and Guennou et al. [14] found that BFO transforms to the orthorhombic Pnma structure instead of others. While at low pressure, BFO exhibits a variety of phase transitions. For instance, by using x-ray diffraction (XRD) and far-infrared spectroscopy, Haumont et al. [12] found that BFO remains the rhombohedral structure up to 6.2 GPa, then changes to a monoclinic structure with space group C2/m. Nevertheless, in a more recent study, a phase transition from the polar rhombohedral R3c phase to the antipolar orthorhombic Pbam phase with antiferroelectric character of atomic displacements has been revealed at 3 GPa by using neutron powder diffraction [15]. Furthermore, Guennou et al. [14] have reported that three different phase transitio...

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“…Both types of distortions define the symmetry of the perovskite lattice and control electric and magnetic properties as well as a cross-coupling between them. The energy landscape of some Bi-containing compositions consists of several almost degenerate phase states that can be switched by relatively small perturbations [12][13][14][15][16]. This offers a unique opportunity to study the structure-properties relationship using distinct structural modifications of the same material.…”

Section: Introductionmentioning

confidence: 99%

Magnetic structure of an incommensurate phase of La-dopedBiFe0.5Sc0.5O3: Role of antisymmetric exchange interactions

et al. 2015

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A 20% substitution of Bi with La in the perovskite Bi 1−x La x Fe 0.5 Sc 0.5 O 3 system obtained under high-pressure and high-temperature conditions has been found to induce an incommensurately modulated structural phase. The room-temperature x-ray and neutron powder diffraction patterns of this phase were successfully refined using the I mma(0,0,γ )s00 superspace group (γ = 0.534(3)) with the modulation applied to Bi/La and oxygen displacements. The modulated structure is closely related to the prototype antiferroelectric structure of PbZrO 3 which can be considered as the lock-in variant of the latter with γ = 0.5. Below T N ∼ 220 K, the neutron diffraction data provide evidence for a long-range G-type antiferromagnetic ordering commensurate with the average I mma structure. Based on a general symmetry consideration, we show that the direction of the spins is controlled by the antisymmetric exchange imposed by the two primary structural distortions, namely oxygen octahedral tilting and incommensurate atomic displacements. The tilting is responsible for the onset of a weak ferromagnetism, observed in magnetization measurements, whereas the incommensurate displacive mode is dictated by the symmetry to couple a spin-density wave. The obtained results demonstrate that antisymmetric exchange is the dominant anisotropic interaction in Fe 3+ -based distorted perovskites with a nearly quenched orbital degree of freedom.

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Antipolar phase in multiferroic BiFeO3at high pressure

Cited by 61 publications

References 34 publications

Pressure-induced polar phases in relaxor multiferroicPbFe0.5Nb0.5O3<

Pressure-induced polar phases in relaxor multiferroicPbFe0.5Nb0.5O3<

Pressure-induced phase transitions of multiferroic BiFeO ₃

Magnetic structure of an incommensurate phase of La-dopedBiFe0.5Sc0.5O3: Role of antisymmetric exchange interactions

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