Structural polymorphism in multiferroic BiMnO3 at high pressures and temperatures

Козленко, Д. П.; Dang, N. T.; Jabarov, S. H.; Belik, Alexei А.; Кичанов, С. Е.; Лукин, Е. В.; Lathe, C.; Dubrovinsky, Leonid; Kazimirov, V. Yu.; Smirnov, M. B.; Савенко, Б. Н.; Mammadov, A. I.; Takayama‐Muromachi, E.; Khiem, L. H.

doi:10.1016/j.jallcom.2013.10.020

Cited by 32 publications

(20 citation statements)

References 28 publications

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“…As a consequence, the upward or downward shift of a phonon at the magnetic phase transitions derives from the presence of FM and AFM interactions, which can lead in perovskite-type AMnO 3 solid solutions to either trends, depending on the chemical composition [31]. In our present case of BMO, the two high-frequency bands are dominated by breathinglike vibrations of the light oxygens in the MnO 6 octahedra (see also the recent assignment of Raman modes of BMO in the C2/c space group by Kozlenko et al [32]) and the downward shift of their frequencies indicate that they are dominated by FM intercations. We note that the above-discussed anomalies were not observed in the infrared study of polycrystalline BMO, which have been recently studied as a function of temperature by Goian et al [23], which is likely due to the limited number of only five investigated temperatures, probably insufficient for detecting subtle changes.…”

Section: B Phonons Modes Versus Temperaturementioning

confidence: 56%

Single-crystallineBiMnO3studied by temperature-dependent x-ray diffraction and Raman spectroscopy

et al. 2014

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We report on the temperature dependence of the phonons and crystallographic parameters in BiMnO 3 single crystals grown under high pressure and high temperature. The crystallographic structure of the sample was refined from room temperature to liquid helium temperature in the centrosymmetric C2/c space group, i.e., a group which does not allow ferroelectricity. In addition, the lattice dynamics was probed by Raman spectroscopy down to liquid nitrogen temperature, i.e., below the ferromagnetic transition at T C = 100 ± 2 K. Both crystallographic and Raman data indicate the absence of a structural phase transition at the ferromagnetic ordering or any other temperature. The Raman signature around T C shows a significant spin-phonon coupling for the high-frequency bands.

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Section: B Phonons Modes Versus Temperaturementioning

confidence: 56%

Single-crystallineBiMnO3studied by temperature-dependent x-ray diffraction and Raman spectroscopy

et al. 2014

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“…27 These modes can be decomposed on the irreducible representations of 2ℎ point group as 13 ⨁14 . In figure 4(a) 32 and polarized measurements reported by Talkenberger et al 33 and Himcinschi et al 15 for the monoclinic BCO phase.…”

Section: Resultsmentioning

confidence: 84%

Spin–phonon coupling in monoclinic BiCrO3

Araújo

Arévalo‐López

Santos

et al. 2020

Journal of Applied Physics

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Monoclinic BiCrO3, synthesized at high pressure and high temperature, presents interesting properties with anomalies of magnetic origin observed around 110 and 80 K, which are associated, respectively, with the rising of a G-type antiferromagnetic structure and the spin reorientation along one of the monoclinic axes. In this study, we report a strong spin-phonon coupling in monoclinic BiCrO3 observed by Raman spectroscopy. The renormalization of the phonon energy confirms the coupling with the magnetic orderings. Interestingly, not all the phonons exhibiting this effect ate the temperature of the spin reorientation evidence the G-type antiferromagnetic ordering at 80 K. A wellstablished models based on the mean-field theory, previously applied to other perovskite compounds, was used to analyze the spin-phonon coupling showing different associated with each magnetic phase.

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“…A monoclinic to monoclinic phase transition is predicted at P = 10 GPa induced by a magnetic to volume instability in BiMnO 3 . Recently, Kozlenko et al (2014) determined the phase diagram of BiMnO 3 to a pressure of 50 GPa and investigated the phase relationships as a function of temperature and pressure in the range T = 300-900 K from ambient pressure to 4 GPa using X-ray diffraction and Raman spectroscopy. Two new high-pressure phases with C2/m symmetry, but distinctly different structural parameters, have been identified at moderate pressures and temperatures, as had been previously suggested based on the results from firstprinciples calculations (Mei et al, 2010).…”

Section: Multiferroic Materials With Perovskite Structurementioning

confidence: 99%

High pressure and multiferroics materials: a happy marriage

Gilioli

Ehm

2014

Int Union Crystallogr J

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The community of material scientists is strongly committed to the research area of multiferroic materials, both for the understanding of the complex mechanisms supporting the multiferroism and for the fabrication of new compounds, potentially suitable for technological applications. The use of high pressure is a powerful tool in synthesizing new multiferroic, in particular magneto-electric phases, where the pressure stabilization of otherwise unstable perovskite-based structural distortions may lead to promising novel metastable compounds. The in situ investigation of the high-pressure behavior of multiferroic materials has provided insight into the complex interplay between magnetic and electronic properties and the coupling to structural instabilities.

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Structural polymorphism in multiferroic BiMnO3 at high pressures and temperatures

Cited by 32 publications

References 28 publications

Single-crystallineBiMnO3studied by temperature-dependent x-ray diffraction and Raman spectroscopy

Single-crystallineBiMnO3studied by temperature-dependent x-ray diffraction and Raman spectroscopy

Spin–phonon coupling in monoclinic BiCrO3

High pressure and multiferroics materials: a happy marriage

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