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• W4307442977 abstract "We have investigated the Cu-derived electronic structure of iridium spinel compound ${mathrm{CuIr}}_{2}{mathrm{S}}_{4}$ with a metal-insulator transition (MIT) at ${T}_{mathrm{MIT}}ensuremath{sim}230$ K by means of high-energy resolution fluorescence-detected x-ray absorption spectroscopy (HERFD-XAS) and Cu $Kensuremath{alpha}$ resonant x-ray emission spectroscopy (RXES) around the Cu $K$ absorption edge. The Cu $K$ HERFD-XAS spectrum in the metallic phase exhibits a peak in the pre-edge region at an incident photon energy of $h{ensuremath{nu}}_{mathrm{in}}=8981$ eV. The peak is ascribed to the Cu $1s--3d$ quadrupole transition and is abruptly shifted to higher energy by about 0.5 eV on going from metallic to insulating phases. The energy shift of the unoccupied Cu $3d$ states is related to the insulator gap formation of ${mathrm{CuIr}}_{2}{mathrm{S}}_{4}$ via the hybridization with the Ir $5d$--S $3p$ bands. A hysteresis behavior is observed in the Cu $1s--3d$ peak intensity between cooling and heating processes around ${T}_{mathrm{MIT}}$, consistent with those observed in the transport properties. The abrupt change in the unoccupied Cu $3d$ states across MIT is also clearly detected in the Cu $Kensuremath{alpha}$ RXES spectra." @default.
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• W4307442977 date "2022-10-27" @default.
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• W4307442977 title "Metal-insulator transition in <mml:math xmlns:mml=http://www.w3.org/1998/Math/MathML><mml:mrow><mml:msub><mml:mi>CuIr</mml:mi><mml:mn>2</mml:mn></mml:msub><mml:msub><mml:mi mathvariant=normal>S</mml:mi><mml:mn>4</mml:mn></mml:msub></mml:mrow></mml:math> observed by Cu <mml:math xmlns:mml=http://www.w3.org/1998/Math/MathML><mml:mrow><mml:mi>K</mml:mi><mml:mi>α</mml:mi></mml:mrow></mml:math> resonant x-ray emission spectroscopy" @default.
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• W4307442977 doi "https://doi.org/10.1103/physrevb.106.155151" @default.
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