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• W2612768238 abstract "The structural phase transition in hexagonal ${mathrm{BaMnO}}_{3}$ occurring at ${T}_{mathrm{C}}=130$ K was studied in ceramic samples using electron and x-ray diffraction, second harmonic generation, as well as by dielectric and lattice dynamic spectroscopies. The low-temperature phase (space group $P{6}_{3}cm)$ is ferroelectric with a triplicated unit cell. The phase transition is driven by an optical soft mode from the Brillouin-zone boundary $[q=(frac{1}{3},frac{1}{3},0)]$; this mode activates in infrared and Raman spectra below ${T}_{mathrm{C}}$ and it hardens according to the Cochran law. Upon cooling below ${T}_{mathrm{C}}$, the permittivity exhibits an unusual linear increase with temperature; below 60 K, in turn, a frequency-dependent decrease is observed, which can be explained by slowing down of ferroelectric domain wall motions. Based on our data we could not distinguish whether the high-temperature phase is paraelectric or polar (space groups $P{6}_{3}/mmc$ or $P{6}_{3}mc$, respectively). Both variants of the phase transition to the ferroelectric phase are discussed based on the Landau theory. Electron paramagnetic resonance and magnetic susceptibility measurements reveal an onset of one-dimensional antiferromagnetic ordering below $ensuremath{approx}220phantom{rule{0.16em}{0ex}}mathrm{K}$ which develops fully near 140 K and, below ${T}_{mathrm{N}}ensuremath{approx}59$ K, it transforms into a three-dimensional antiferromagnetic order." @default.
• W2612768238 created "2017-05-19" @default.
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• W2612768238 date "2017-05-12" @default.
• W2612768238 modified "2023-10-14" @default.
• W2612768238 title "Unusual ferroelectric and magnetic phases in multiferroic <mml:math xmlns:mml=http://www.w3.org/1998/Math/MathML><mml:mrow><mml:mn>2</mml:mn><mml:msub><mml:mrow><mml:mi>H</mml:mi><mml:mtext>−</mml:mtext><mml:mi>BaMnO</mml:mi></mml:mrow><mml:mn>3</mml:mn></mml:msub></mml:mrow></mml:math> ceramics" @default.
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• W2612768238 doi "https://doi.org/10.1103/physrevb.95.174103" @default.
• W2612768238 hasPublicationYear "2017" @default.
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