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Sökning: WFRF:(Kitazawa Hideaki)

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1.
  • Yamaoka, Hitoshi, et al. (författare)
  • High-resolution photoelectron spectroscopy study of Kondo metals : SmSn3 and Sm0.9La0.1Sn3
  • 2012
  • Ingår i: Physical Review B Condensed Matter. - 0163-1829 .- 1095-3795. ; 85:11, s. 115120-
  • Tidskriftsartikel (refereegranskat)abstract
    • We performed a high-resolution photoelectron spectroscopy study on the Kondo metals SmSn3 and Sm0.9La0.1Sn3. The experimental results are compared with calculations of density of state performed within the local density approximation plus the dynamical mean-field theory. The theory is found to reproduce the experimental valence-band spectra well. In both SmSn3 and Sm0.9La0.1Sn3 the bulk Sm valence is nearly trivalent, with a small fraction of divalent component. Resonant photoelectron spectroscopy indicates a decrease in the Kondo effect in the diluted system Sm0.9La0.1Sn3.
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2.
  • Prchal, Jiri, et al. (författare)
  • Structural discontinuity in the hexagonal RTA1 compounds : Experiments and density-functional theory calculations
  • 2008
  • Ingår i: Physical Review B. Condensed Matter and Materials Physics. - 1098-0121 .- 1550-235X. ; 77:13, s. 134106-
  • Tidskriftsartikel (refereegranskat)abstract
    • An anomalous behavior of the lattice parameters is reported for RTAl and R(T,T-')Al compounds, with R a rare-earth element and T and T-' transition metals or Cu. In these compounds, which crystallize in the hexagonal ZrNiAl-type of structure, an abrupt transition in the temperature or composition dependence of the lattice constants a and c is observed with the common feature that values of the c/a ratio around 0.565-0.575 are generally not realized. Total-energy calculations based on density-functional theory show the occurrence of two close energy minima, which explains the observed structural instability and the associated transitions.
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