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- W2091892227 abstract "The bulk and surface valence states of Yb were determined for the intermetallic compound Yb${mathrm{Pd}}_{2}$${mathrm{Si}}_{2}$ by magnetic susceptibility ($ensuremath{chi}$), ${L}_{mathrm{III}}$-edge x-ray absorption, and valence-band photoemission measurements. In the susceptibility data this compound exhibits the characteristic features of homogeneously mixed-valent systems: enhanced Pauli paramagnetism at low temperatures, a maximum in $ensuremath{chi}$ at about 30 K, and Curie-Weiss behavior at high temperatures. The observed temperature dependence of $ensuremath{chi}$ is discussed in light of interconfigurational fluctuation (ICF) as well as Fermi-liquid models. The mixed-valent state of Yb is also borne out in the ${L}_{mathrm{III}}$-edge x-ray absorption spectra, which reveal a weak temperature dependence of the Yb mean valence $overline{v}$ in agreement with the results from an analysis of the $ensuremath{chi}$ data in light of the ICF model. Valence-band photoemission spectra support our view of a homogeneously mixed-valent state of Yb; they further identify a valence transition to the divalent state in the outermost surface layer. $4f$ binding energies are found to be 0.80ifmmodepmelsetextpmfi{}0.05 eV higher at the surface as compared to the bulk. All three methods suggest that---within the limits of accuracy---the room-temperature mean valence of Yb in Yb${mathrm{Pd}}_{2}$${mathrm{Si}}_{2}$ is close to the high-temperature limit given by the ionic ICF model." @default.
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- W2091892227 date "1984-05-15" @default.
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- W2091892227 title "Valence instability in Yb<mml:math xmlns:mml=http://www.w3.org/1998/Math/MathML display=inline><mml:mrow><mml:msub><mml:mrow><mml:mi mathvariant=normal>Pd</mml:mi></mml:mrow><mml:mrow><mml:mn>2</mml:mn></mml:mrow></mml:msub></mml:mrow></mml:math><mml:math xmlns:mml=http://www.w3.org/1998/Math/MathML display=inline><mml:mrow><mml:msub><mml:mrow><mml:mi mathvariant=normal>Si</mml:mi></mml:mrow><mml:mrow><mml:mn>2</mml:mn></mml:mrow></mml:msub></mml:mrow></mml:math>: Magnetic …" @default.
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- W2091892227 doi "https://doi.org/10.1103/physrevb.29.5702" @default.
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