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- W2024358123 abstract "We report Raman spectra of single-crystalline ${mathrm{Gd}}_{2}$${mathrm{BaNiO}}_{5}$ and ${mathrm{Y}}_{2}$${mathrm{BaNiO}}_{5}$, concentrating on identification and assignment of the phonons at room temperature. All nine of the expected Raman-active phonons (3${mathit{A}}_{mathit{g}}$+1${mathit{B}}_{1mathit{g}}$+2${mathit{B}}_{2mathit{g}}$+3${mathit{B}}_{3mathit{g}}$) are observed. The three Gd(Y) related modes of ${mathit{B}}_{2mathit{g}}$, ${mathit{A}}_{mathit{g}}$, and ${mathit{B}}_{3mathit{g}}$ symmetry are observed at 123(160), 175(233), and 204(269) ${mathrm{cm}}^{mathrm{ensuremath{-}}1}$, respectively. The six O(1) vibrational modes of the Gd(Y) compound occur at 183(184), 312(328), 335(340), 422(440), 518(540), and 562(584) ${mathrm{cm}}^{mathrm{ensuremath{-}}1}$, having ${mathit{B}}_{3mathit{g}}$, ${mathit{B}}_{2mathit{g}}$, ${mathit{B}}_{1mathit{g}}$, ${mathit{B}}_{3mathit{g}}$, ${mathit{A}}_{mathit{g}}$, and ${mathit{A}}_{mathit{g}}$ symmetries, respectively. A strong mode polarized along the Ni-O(2) chain axis at ensuremath{sim}726(755) ${mathrm{cm}}^{mathrm{ensuremath{-}}1}$ in the Gd(Y) compound may arise from magnetic excitations along the spin chains or from a Raman-forbidden, infrared-allowed vibrational mode along the Ni-O(2) chains." @default.
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- W2024358123 title "Raman-active phonons of the spin-1 chain antiferromagnets<mml:math xmlns:mml=http://www.w3.org/1998/Math/MathML display=inline><mml:mrow><mml:msub><mml:mrow><mml:mi mathvariant=italic>R</mml:mi></mml:mrow><mml:mrow><mml:mn>2</mml:mn></mml:mrow></mml:msub></mml:mrow></mml:math><mml:math xmlns:mml=http://www.w3.org/1998/Math/MathML display=inline><mml:mrow><mml:msub><mml:mrow><mml:mi mathvariant=normal>BaNiO</mml:mi></mml:mrow><mml:mrow><mml:mn>5</mml:mn></mml:mrow></mml:msub></mml:…" @default.
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- W2024358123 doi "https://doi.org/10.1103/physrevb.50.551" @default.
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