Effect of high pressure on multiferroic<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msub><mml:mrow><mml:mtext>BiFeO</mml:mtext></mml:mrow><mml:mn>3</mml:mn></mml:msub></mml:mrow></mml:math>

Haumont, R.; Bouvier, Pierre; Pashkin, Alexej; Rabia, K.; Frank, S.; Dkhil, Brahim; Crichton, Wilson A.; Kuntscher, C. A.; Kreisel, J.

doi:10.1103/physrevb.79.184110

Cited by 154 publications

(128 citation statements)

References 74 publications

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“…Haumont 12,13 and Pashkin 14 used Raman spectroscopy, far infrared and synchrotron diffraction measurements to show the presence of two structural phase transitions (rhombohedral-orthorhombic(1)-orthorhombic(2)) at ranges of between 2.5-3.5 GPa and 0021-8979/2013/113(18)/183910/7/$30.00…”

Section: Introductionmentioning

confidence: 99%

Pressure induced para-antiferromagnetic switching in BiFeO3–PbTiO3 as determined using in-situ neutron diffraction

Comyn

Stevenson

Al-Jawad

et al. 2013

Journal of Applied Physics

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ReuseUnless indicated otherwise, fulltext items are protected by copyright with all rights reserved. The copyright exception in section 29 of the Copyright, Designs and Patents Act 1988 allows the making of a single copy solely for the purpose of non-commercial research or private study within the limits of fair dealing. The publisher or other rights-holder may allow further reproduction and re-use of this version -refer to the White Rose Research Online record for this item. Where records identify the publisher as the copyright holder, users can verify any specific terms of use on the publisher's website. TakedownIf you consider content in White Rose Research Online to be in breach of UK law, please notify us by emailing eprints@whiterose.ac.uk including the URL of the record and the reason for the withdrawal request.Pressure induced para-antiferromagnetic switching in BiFeO 3 -PbTiO 3 as determined using in-situ neutron diffraction BiFeO 3 -PbTiO 3 exhibits both ferroelectric and antiferromagnetic order, depending on the composition. Moderate hydrostatic pressures have been used at room temperature to transform the crystallographic phase from P4mm to R3c for the compositions 0.7BiFeO 3 -0.3PbTiO 3 and 0.65BiFeO 3 -0.35PbTiO 3 ,a sd e t e r m i n e du s i n gin-situ neutron diffraction. Using Rietveld refinements, the resultant data showed that, for both compositions, a transformation from para-to G-type antiferromagnetic order accompanied the structural transition. The transformation occurred over the range 0.4-0.77 and 0.67-0.88 GPa for 0.7BiFeO 3 -0.3PbTiO 3 and 0.65BiFeO 3 -0.35PbTiO 3 , respectively; at intermediate pressures, a mixture of P4mm and R3c phases were evident. These pressures are far lower than required to induce a phase transition in either the BiFeO 3 or PbTiO 3 end members. The driving force for this pressure induced first order phase transition is a significant difference in volume between the two phases, P4mm > R3c of 4%-5%, at ambient pressure. Upon removal of the pressure, 0.65BiFeO 3 -0.35PbTiO 3 returned to the paramagnetic tetragonal state, whereas in 0.7BiFeO 3 -0.3PbTiO 3 antiferromagnetic ordering persisted, and the structural phase remained rhombohedral. Using conventional laboratory x-ray diffraction with a hot-stage, the phase readily reverted back to a tetragonal phase, at temperatures between 100 and 310 Cf o r 0.7BiFeO 3 -0.3PbTiO 3 , far lower than the ferroelectric Curie point for this composition of 632 C. To our knowledge, the reported pressure induced para-to antiferromagnetic transition is unique in the literature. V C 2013 AIP Publishing LLC.[http://dx

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Section: Introductionmentioning

confidence: 99%

Pressure induced para-antiferromagnetic switching in BiFeO3–PbTiO3 as determined using in-situ neutron diffraction

Comyn

Stevenson

Al-Jawad

et al. 2013

Journal of Applied Physics

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“…Due to these exceptional characteristics, BFO has become one of the most studied multiferroic materials leading to a wealth of experimental and simulation results covering both structure and dynamics 3,[11][12][13][14][15][16][17] . The keen and continuous interest is equally motivated by the controversies raised by a priori incompatible experimental findings: determination and interpretation of phase diagram, occurence and nature of phase transitions, assignment and characterization of frequency modes from different spectroscopy techniques (Raman, infrared, ...) 3,14,16,18,19 .…”

mentioning

confidence: 99%

High-temperature phonon spectra of multiferroic BiFeO3 from inelastic neutron spectroscopy

Zbiri

Schober

Choudhury

et al. 2012

Applied Physics Letters

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We report inelastic neutron scattering measurements of the phonon spectra in a pure powder sample of the multiferroic material BiFeO3. A high-temperature range was covered to unravel the changes in the phonon dynamics across the Néel (TN ∼ 650 K) and Curie (TC ∼ 1100 K) temperatures. Experimental results are accompanied by ab-initio lattice dynamical simulations of phonon density of states to enable microscopic interpretations of the observed data. The calculations reproduce well the observed vibrational features and provide the partial atomic vibrational components. Our results reveal clearly the signature of three different phase transitions both in the diffraction patterns and phonon spectra. The phonon modes are found to be most affected by the transition at the TC . The spectroscopic evidence for the existence of a different structural modification just below the decomposition limit (TD ∼ 1240 K) is unambiguous indicating strong structural changes that may be related to oxygen vacancies and concomitant Fe 3+ → Fe 2+ reduction and spin transition.PACS numbers: 75.85.+t, 78.70.Nx, 71.15.Mb, 63.20.dk Multiferroism is the combination of two or more of the following properties: ferroelectricity, ferromagnetism and ferroelasticity. In particular, tuning the electric or magnetic properties by applying a magnetic or an electric field, respectively, is at the basis of new applications in microelectronics, spintronics, data storage and computing hardware 1-3 . This explains the strong interest in multiferroic materials from a practical point of view. They unfortunately do not abound in nature and are often difficult to synthesize technologically. Within the most important ABO 3 perovskite family the scarcity of multiferroic properties is mainly due to the d-electrons of the B cation, which on one side are necessary for magnetism but on the other side tend to reduce the tendency for an off-centering ferroelectric distortion 4 . A remarkable exception is bismuth ferrite BiFeO 3 (BFO). This material seems to be unique in exhibiting multiferroic behavior above room temperature. It is simultaneously ferroelectric, antiferromagnetic and ferroelastic, and is subject to crystallographic distortions. The mixture of these multiple order parameters involved in its phase transitions is believed to lead to a very rich phase diagram 3,5 . The physical behavior of BFO is characterized by two largely different transition temperatures; antiferromagnetic with T N ∼ 600 -650 K and ferroelectric with T C ∼ 1050 -1100 K, and a polarization that can reach a very large 3,6 value ∼ 100 µC/m 2 . The large value of the Curie temperature could be at the origin of the observed colossal spontaneous polarization through a strong ferroelectric ordering 7 . The polarization in BFO is mainly caused by the Bi 6s 2 lone pair, so that ferroelectricity is induced primarily via this site (strong cation displacements). Another remarkable aspect of BFO is the occurrence of FeO 6 octahedra tilts accompanying the strong Bi 3+ displacements at room tempera...

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“…58) For CdS microcrystals, they studied the evolution of phonon frequencies and spectral shape with pressure, and found that smaller microcrystals were ''stiffer'' in terms of phonon properties. 59) The pressure evolution of phonon spectra has also been studied with IR-SR for other bulk materials such as ZnO, 60) HfW 2 O 8 , 61) BiFeO 3 , 62) and RMnO 3 (R ¼ Y, Ho, Lu). 63) ZnO is a well-known wide-band-gap semiconductor having potential for practical applications, and its thermal properties are also of interest.…”

Section: Phonon Spectroscopy Under High Pressurementioning

confidence: 99%

“…61) Multiferroic BiFeO 3 and RMnO 3 have recently attracted much interest, since the coupling between magnetic and dielectric properties result in novel physical properties. 62,63) These compounds show structural phase transitions under high pressure, and changes in the phonon spectrum and the pressure shift of the phonon frequencies were studied in detail. An example of far-IR reflectance data for BiFeO 3 , 62) which shows both magnetic order and ferroelectricity in the same phase, is shown in Fig.…”

Section: Phonon Spectroscopy Under High Pressurementioning

confidence: 99%

Infrared and Terahertz Spectroscopy of Strongly Correlated Electron Systems under Extreme Conditions

Kimura

Okamura

2013

J. Phys. Soc. Jpn.

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Owing to its high brilliance, infrared and terahertz synchrotron radiation (IR/THz-SR) has emerged as a powerful tool for spectroscopy under extreme (i.e., technically more difficult) experimental conditions such as high pressure, high magnetic field, high spatial resolution, and a combination of these. The methodologies for pressure-and magneticfield-dependent spectroscopy and microscopy using IR/THz-SR have advanced rapidly worldwide. By applying them to strongly correlated electron systems (SCESs), many experimental studies have been performed on their electronic structures and phonon/molecular vibration modes under extreme conditions. Here, we review the recent progress of methodologies of IR/THz-SR spectroscopy and microscopy, and the experimental results on SCESs and other systems obtained under extreme conditions.

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Effect of high pressure on multiferroicBiFeO3

Cited by 154 publications

References 74 publications

Pressure induced para-antiferromagnetic switching in BiFeO3–PbTiO3 as determined using in-situ neutron diffraction

Pressure induced para-antiferromagnetic switching in BiFeO3–PbTiO3 as determined using in-situ neutron diffraction

High-temperature phonon spectra of multiferroic BiFeO3 from inelastic neutron spectroscopy

Infrared and Terahertz Spectroscopy of Strongly Correlated Electron Systems under Extreme Conditions

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