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- W2034246136 abstract "We present the infrared and Raman spectra of ${ensuremath{beta}phantom{rule{0.1em}{0ex}}}^{ensuremath{''}}{text{ensuremath{-}}(mathrm{BEDT}text{ensuremath{-}}mathrm{TTF})}_{3}{{(mathrm{ReO}}_{4})}_{2}$ $(mathrm{BEDT}text{ensuremath{-}}mathrm{TTF}=mathrm{bis}text{ensuremath{-}}text{ethylenedithio}text{ensuremath{-}}text{tetrathiafulvalene})$ measured at various temperatures. We investigated the three $mathrm{C}mathrm{C}$ stretching modes, ${ensuremath{nu}}_{2},{ensuremath{nu}}_{27}$, and ${ensuremath{nu}}_{3}$. The infrared and Raman spectra discontinuously changed at $80phantom{rule{0.3em}{0ex}}mathrm{K}$. Below $80phantom{rule{0.3em}{0ex}}mathrm{K}$, for example, the doublet ${ensuremath{nu}}_{2}$ bands split into three peaks, the doublet ${ensuremath{nu}}_{27}$ also split into three, and a mutual exclusion rule for the vibronic ${ensuremath{nu}}_{3}$ modes in the infrared and Raman spectra was broken. This symmetry lowering was consistent with the result of x-ray crystal structure analyses conducted at $100phantom{rule{0.3em}{0ex}}mathrm{K}$ and $22phantom{rule{0.3em}{0ex}}mathrm{K}$. The site charges in the unit cell estimated from the splitting of ${ensuremath{nu}}_{2}$ were $+{0.7}_{3},+{0.7}_{3}$, and $+{0.5}_{3}$ in the metallic phase, and they were $+0.2,+{0.8}_{5}$, and $+{0.9}_{5}$ in the insulating phase. The metal-insulator transition of this compound was characterized as the charge-ordering transition originated from the localization of charge due to Coulomb interactions." @default.
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- W2034246136 title "Infrared and Raman evidence for the charge-ordering in<mml:math xmlns:mml=http://www.w3.org/1998/Math/MathML display=inline><mml:mrow><mml:msup><mml:mrow><mml:mi>β</mml:mi><mml:mspace width=0.1em /></mml:mrow><mml:mo>″</mml:mo></mml:msup><mml:msub><mml:mrow><mml:mtext>−</mml:mtext><mml:mo>(</mml:mo><mml:mi mathvariant=normal>BEDT</mml:mi><mml:mtext>−</mml:mtext><mml:mi mathvariant=normal>TTF</mml:mi><mml:mo>)</mml:mo></mml:mrow><mml:mn>3</mml:mn></mml:msub><mml:msub><mml:mrow><mml:…" @default.
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- W2034246136 doi "https://doi.org/10.1103/physrevb.70.125102" @default.
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