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• W2027466881 abstract "The effects of hydrostatic pressure on a structure and the corresponding resonant x-ray scattering (RXS) spectrum have been investigated for the hole-orbital-ordered compound ${({mathrm{C}}_{2}{mathrm{H}}_{5}mathrm{N}{mathrm{H}}_{3})}_{2}mathrm{Cu}{mathrm{Cl}}_{4}$. We have found a structural phase transition at ${P}_{mathrm{c}}ensuremath{sim}4phantom{rule{0.3em}{0ex}}mathrm{GPa}$, as suggested by the Raman scattering measurement, by observing a peak splitting resulting from an orthorhombic-to-monoclinic symmetry breaking. The reduction of the Jahn-Teller distortion (JTD) toward ${P}_{mathrm{c}}$ is also ascertained by structural analyses. The gradual change in the color of the crystal is also observed in connection with the structural change near ${P}_{mathrm{c}}$. The red-colored transparency of the crystal indicates that the system is still insulative above ${P}_{mathrm{c}}$. The observed RXS and fluorescence spectrum at ambient pressure were precisely analyzed. We experimentally confirmed that the RXS intensity comes from the polarization of the density of states of ${p}_{mathrm{x}}$ and ${p}_{mathrm{y}}$ symmetries, which is mainly dominated not by the on-site $3dtext{ensuremath{-}}4p$ Coulomb interaction but by the JTD of the $mathrm{Cu}{mathrm{Cl}}_{6}$ octahedron. charged Cl ions neighboring the Cu site. It is also expected that the RXS intensity is proportional to JTD; however, our RXS study under a high pressure shows no striking change as JTD is suppressed by the application of pressure. On the other hand, the RXS intensity becomes zero above ${P}_{mathrm{c}}$. The results indicate that the local environment of the ${mathrm{Cu}}^{2+}$ ion markedly changes. Two possible structures of ${mathit{EA}}_{2}mathrm{Cu}{mathrm{Cl}}_{4}$ above ${P}_{mathrm{c}}$ are proposed." @default.
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• W2027466881 date "2005-07-22" @default.
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• W2027466881 title "Structural properties and phase transition of hole-orbital-ordered<mml:math xmlns:mml=http://www.w3.org/1998/Math/MathML display=inline><mml:mrow><mml:msub><mml:mrow><mml:mo>(</mml:mo><mml:msub><mml:mi mathvariant=normal>C</mml:mi><mml:mn>2</mml:mn></mml:msub><mml:msub><mml:mi mathvariant=normal>H</mml:mi><mml:mn>5</mml:mn></mml:msub><mml:mi mathvariant=normal>N</mml:mi><mml:msub><mml:mi mathvariant=normal>H</mml:mi><mml:mn>3</mml:mn></mml:msub><mml:mo>)</mml:mo></mml:mrow><mml:mn>2…" @default.
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• W2027466881 doi "https://doi.org/10.1103/physrevb.72.014123" @default.
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