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Sökning: WFRF:(Havela L.)

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1.
  • Havela, L., et al. (författare)
  • Electrical resistivity of 5f -electron systems affected by static and dynamic spin disorder
  • 2017
  • Ingår i: Physical Review B. - 2469-9950. ; 95:23
  • Tidskriftsartikel (refereegranskat)abstract
    • Metallic 5f materials have very strong coupling of magnetic moments and electrons mediating electrical conduction. It is caused by strong spin-orbit interaction, coming with high atomic number Z, together with involvement of the 5f states in metallic bonding. We have used the recently discovered class of uranium (ultra)nanocrystalline hydrides, which are ferromagnets with high ordering temperature, to disentangle the origin of negative temperature coefficient of electrical resistivity. In general, the phenomenon of electrical resistivity decreasing with increasing temperature in metals can have several reasons. The magnetoresistivity study of these hydrides reveals that quantum effects related to spin-disorder scattering can explain the resistivity behavior of a broad class of actinide compounds.
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2.
  • Maskova, S., et al. (författare)
  • Lattice anisotropy in uranium ternary compounds: UTX
  • 2012
  • Ingår i: Journal of Alloys and Compounds. - : Elsevier BV. - 0925-8388. ; 522, s. 130-135
  • Tidskriftsartikel (refereegranskat)abstract
    • Several U-based intermetallic compounds (UCoGe, UNiGe with the TiNiSi structure type and UNiAl with the ZrNiAl structure type) and their hydrides were studied from the point of view of compressibility and thermal expansion. Confronted with existing data for the compounds with the ZrNiAl structure type a common pattern emerges. The direction of the U-U bonds with participation of the 5f states is distinctly the "soft" crystallographic direction, exhibiting also the highest coefficient of linear thermal expansion. The finding leads to an apparent paradox: the closer the U atoms are together in a particular direction the better they can be additionally compressed together by applied hydrostatic pressure. (C) 2012 Elsevier B. V. All rights reserved.
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