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Träfflista för sökning "WFRF:(Heikkila P) ;srt2:(2015-2019)"

Sökning: WFRF:(Heikkila P) > (2015-2019)

  • Resultat 31-35 av 35
  • Föregående 123[4]
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31.
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32.
  • Silaev, Mihail, et al. (författare)
  • Long-Range Spin Accumulation from Heat Injection in Mesoscopic Superconductors with Zeeman Splitting
  • 2015
  • Ingår i: ; 114:16
  • Tidskriftsartikel (refereegranskat)abstract
    • We describe far-from-equilibrium nonlocal transport in a diffusive superconducting wire with a Zeeman splitting, taking into account different spin relaxation mechanisms. We demonstrate that due to the Zeeman splitting, an injection of current in a superconducting wire creates spin accumulation that can only relax via thermalization. This effect leads to a long-range spin accumulation detectable in the nonlocal signal. Our model gives a qualitative explanation and provides accurate fits of recent experimental results in terms of realistic parameters.
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33.
  • Silaev, Mihail, et al. (författare)
  • Spin Hanle effect in mesoscopic superconductors
  • 2015
  • Ingår i: ; 91:2, s. 024506-
  • Tidskriftsartikel (refereegranskat)abstract
    • We present a theoretical study of spin transport in a superconducting mesoscopic spin valve under the action of a magnetic field misaligned with respect to the injected spin. We demonstrate that superconductivity can either strongly enhance or suppress the coherent spin rotation, depending on the type of spin relaxation mechanism being dominated either by spin-orbit coupling or spin-flip scattering at impurities. We also predict a subgap contribution to the nonlocal conductance in multiterminal superconducting hybrid structures which completely eliminates the effect of spin rotation at sufficiently low temperatures.
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34.
  • Väliranta, M, et al. (författare)
  • Plant macrofossil evidence for an early onset of the Holocene summer thermal maximum in northernmost Europe.
  • 2015
  • Ingår i: Nature Communications. - : Nature Publishing Group. - 2041-1723. ; 6
  • Tidskriftsartikel (refereegranskat)abstract
    • Holocene summer temperature reconstructions from northern Europe based on sedimentary pollen records suggest an onset of peak summer warmth around 9,000 years ago. However, pollen-based temperature reconstructions are largely driven by changes in the proportions of tree taxa, and thus the early-Holocene warming signal may be delayed due to the geographical disequilibrium between climate and tree populations. Here we show that quantitative summer-temperature estimates in northern Europe based on macrofossils of aquatic plants are in many cases ca. 2 °C warmer in the early Holocene (11,700-7,500 years ago) than reconstructions based on pollen data. When the lag in potential tree establishment becomes imperceptible in the mid-Holocene (7,500 years ago), the reconstructed temperatures converge at all study sites. We demonstrate that aquatic plant macrofossil records can provide additional and informative insights into early-Holocene temperature evolution in northernmost Europe and suggest further validation of early post-glacial climate development based on multi-proxy data syntheses.
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35.
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  • Resultat 31-35 av 35
  • Föregående 123[4]
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