Electronic band structure and Fermi surface of heavy-fermion neptunium superconductor NpPd5Al2

Hiroshi Yamagami, Dai Aoki, Yoshinori Haga, Yoshichika Onuki

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22 Citations (Scopus)


Electronic band structure calculations were carried out for a new neptunium superconductor NpPd5Al2 using a relativistic linear-augmented plane wave method within a local density approximation. The Fermi energy in the band structure is found to be located just on the 5f-bands of the γb 5=2 state with the extremely narrow band width and therefore the theoretical electronic specific heat coefficient γb is extremely large, being γb = 74:0 mJ/(K2·mol), which is compared to γ = 390 mJ/(K 2·mol) estimated experimentally. NpPd5Al 2 is an uncompensated metal. The main electron Fermi surface corresponds to a doughnut-like flat Fermi surface centered at the Γ point which is connected with cylindrical Fermi surfaces elongated along the X-W-P line.

Original languageEnglish
Article number083708
Journaljournal of the physical society of japan
Issue number8
Publication statusPublished - 2007 Aug 1


  • Band structure
  • Fermi surface
  • NpPdAl

ASJC Scopus subject areas

  • Physics and Astronomy(all)


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