<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:msub><mml:mi mathvariant="normal">BiMn</mml:mi><mml:mn>7</mml:mn></mml:msub><mml:msub><mml:mi mathvariant="normal">O</mml:mi><mml:mn>12</mml:mn></mml:msub></mml:math>
: Polar antiferromagnetism by inverse exchange striction

Behr, Dylan; Belik, Alexei А.; Khalyavin, D. D.; Johnson, Roger A.

doi:10.1103/physrevb.107.l140402

Cited by 5 publications

(1 citation statement)

References 34 publications

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“…A smooth and continuous change in the hyperfine magnetic field near TN1 indicates the occurrence of a second-order magnetic phase transition. This conclusion is consistent with the results of a theoretical study of undoped manganite BiMn7O12, according to which the transition at TN1 = 59 K corresponds to the formation of a single E-type AFM structure [68]. At the same time, the magnetic phase transitions at TN2 ≈ 50 K and TN3 ≈ 24 K cannot be seen in the Mössbauer spectra because the former does not Additionally, it should be noted that the SEM data indicates that an average particle size exceeded ~2 µm for the BiMn 6.96 Fe 0.04 O 12 sample (Figure S3).…”

Section: Mössbauer Study In the Temperature Range T < T N1supporting

confidence: 91%

Understanding Complex Interplay Among Different Instabilities in Multiferroic Bimn7o12 Using 57fe Probe Mössbauer Spectroscopy

Glazkova,

Nitsenko,

Sobolev

et al. 2023

Preprint

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Section: Mössbauer Study In the Temperature Range T < T N1supporting

confidence: 91%

Understanding Complex Interplay Among Different Instabilities in Multiferroic Bimn7o12 Using 57fe Probe Mössbauer Spectroscopy

Glazkova,

Nitsenko,

Sobolev

et al. 2023

Preprint

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Two displacive ferroelectric phase transitions in multiferroic quadruple perovskite BiMn7O12

Maia,

Kempa,

Bovtun

et al. 2024

Phys. Rev. B

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We report on the microwave, terahertz (THz), infrared, and Raman spectroscopic studies of BiMn 7 O 12 ceramics, shedding more light onto the nature of two structural phase transitions and their possible relation with ferroelectricity in this compound. We observed a softening of one polar phonon in the THz range on cooling towards 460 and 300 K, i.e., temperatures at which BiMn 7 O 12 undergoes subsequent structural phase transitions from monoclinic I2/m to polar monoclinic Im and triclinic P1 phases. The soft phonon causes dielectric anomalies typical for displacive ferroelectric phase transitions. Microwave measurements performed at 5.8 GHz up to 400 K qualitatively confirmed not only the dielectric anomaly at 300 K, but also revealed two other weak dielectric anomalies near the magnetic phase transitions at 60 and 28 K. This evidences the multiferroic nature of the low-temperature phases, although the relatively high conductivity in the kHz and Hz spectral range prevented us from directly measuring the permittivity and ferroelectric polarization. Some Raman modes sense the magnetic phase transitions occurring near 60 and 25 K, showing that spin-phonon coupling is relevant in this compound and in this temperature range. The deviation of the Mn-O stretching mode frequency from the anharmonic temperature behavior was successfully explained by the spin correlation function calculated from the magnetic contribution to the specific heat.

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Magnetic structures of PrMn7O12 : Intersublattice magnetoelastic coupling and incommensurate spin canting

Behr,

Liu,

Yamaura

et al. 2024

Phys. Rev. B

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We report on the magnetic structures of PrMn7O12, resolving both a high-temperature structure in common with the other R3+Mn7O12 systems and an additional low-temperature phase characterized by a superposed incommensurate (ICM) spin canting. A phenomenological model is developed to account for large magnetoelastic coupling immediately below the Curie temperature, demonstrating that A′B exchange is primarily responsible for the ferrimagnetic structures observed across the R3+Mn7O12 family. Finally, an analytical mean-field minimal model is presented that successfully accounts for all magnetic structures observed in this family of materials, including the canted commensurate and ICM ground states. Published by the American Physical Society 2024

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BiMn7O12 : Polar antiferromagnetism by inverse exchange striction

Cited by 5 publications

References 34 publications

Understanding Complex Interplay Among Different Instabilities in Multiferroic Bimn7o12 Using 57fe Probe Mössbauer Spectroscopy

Understanding Complex Interplay Among Different Instabilities in Multiferroic Bimn7o12 Using 57fe Probe Mössbauer Spectroscopy

Two displacive ferroelectric phase transitions in multiferroic quadruple perovskite BiMn7O12

Magnetic structures of PrMn7O12 : Intersublattice magnetoelastic coupling and incommensurate spin canting

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