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• W2088810210 abstract "We performed a study of the structural and physical properties of YbPtGe${}_{2}$. This compound is a multivalent charge-ordered system presenting an unusual spin pseudogap below 200 K. The crystal structure of YbPtGe${}_{2}$ is refined from single-crystal and powder high-resolution synchrotron x-ray diffraction data at different temperatures. Analysis of the structural features of YbPtGe${}_{2}$, together with a combined study of Yb ${L}_{mathrm{III}}$ x-ray absorption spectroscopy, magnetic susceptibility $ensuremath{chi}(T)$, thermopower $S(T)$, and ${}^{171}$Yb and ${}^{195}$Pt NMR indicate half of the Yb atoms to be in an intermediate valence state with an electronic configuration close to 4${f}^{13}$ (Yb${}^{3+}$), while for the remaining Yb atoms the 4${f}^{14}$ (Yb${}^{2+}$) configuration with almost no valence fluctuations is most likely. A drastic drop of the magnetic susceptibility and a decrease of the isotropic shift ${}^{195}{K}_{mathrm{iso}}(T)$ with decreasing temperature in the temperature range of 50--200 K evidence the opening of a spin pseudogap with an activation energy of $ensuremath{Delta}/{k}_{mathrm{B}}$ $ensuremath{sim}$ 200 K. Surprisingly, transport properties do not show clear evidence for the opening of a charge gap, thus excluding a standard Kondo-insulator scenario. Possible origins for this unusual electronic (valence) behavior are discussed." @default.
• W2088810210 created "2016-06-24" @default.
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• W2088810210 date "2012-12-21" @default.
• W2088810210 modified "2023-10-16" @default.
• W2088810210 title "YbPtGe<mml:math xmlns:mml=http://www.w3.org/1998/Math/MathML display=inline><mml:msub><mml:mrow /><mml:mn>2</mml:mn></mml:msub></mml:math>: A multivalent charge-ordered system with an unusual spin pseudogap" @default.
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• W2088810210 doi "https://doi.org/10.1103/physrevb.86.235138" @default.
• W2088810210 hasPublicationYear "2012" @default.
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