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- W4315705585 abstract "We report the electronic structure of ${mathrm{BaIr}}_{2}{mathrm{Ge}}_{7}$ with two types of cage structure by means of angle-resolved photoemission spectroscopy (ARPES) and hard x-ray photoemission spectroscopy. ARPES spectra reveal the three-dimensional and multiband Fermi surfaces (FSs) originating from the hybridized Ir $5d$ and Ge $4p$ orbitals. The observed FSs show ${C}_{2}$ symmetry, reflecting the orthorhombic $Ammm$ crystal structure of ${mathrm{BaIr}}_{2}{mathrm{Ge}}_{7}$. The temperature dependence of the ARPES spectra exhibits the thermal spectral broadening, and the width of the spectral peak shows a concave-downward behavior with temperature. Considering the effect of anharmonic phonon modes, we have reproduced the temperature dependence of the electrical resistivity as well as the thermal spectral broadening. The resultant renormalized phonon frequencies ${ensuremath{omega}}_{mathrm{r}0}^{(1)}=146.9phantom{rule{0.16em}{0ex}}mathrm{K}$ and ${ensuremath{omega}}_{mathrm{r}0}^{(2)}=70.6phantom{rule{0.16em}{0ex}}mathrm{K}$ are comparable to the Einstein temperatures estimated from the previous specific heat measurement. Our results suggest the existence of the weak anharmonic phonon modes in ${mathrm{BaIr}}_{2}{mathrm{Ge}}_{7}$." @default.
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- W4315705585 date "2023-01-12" @default.
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- W4315705585 title "Electronic structure and anharmonic phonon mode in <mml:math xmlns:mml=http://www.w3.org/1998/Math/MathML><mml:msub><mml:mi mathvariant=normal>BaIr</mml:mi><mml:mn>2</mml:mn></mml:msub><mml:msub><mml:mi mathvariant=normal>Ge</mml:mi><mml:mn>7</mml:mn></mml:msub></mml:math> with two-dimensional Ba-Ge networks studied by photoemission spectroscopy" @default.
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- W4315705585 doi "https://doi.org/10.1103/physrevb.107.045116" @default.
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