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Fermi surface of the superconductor BaIr2 P2

  • Author(s): Förster, T;
  • Bergk, B;
  • Ignatchik, O;
  • Bartkowiak, M;
  • Blackburn, S;
  • Côté, M;
  • Seyfarth, G;
  • Berry, N;
  • Fisk, Z;
  • Sheikin, I;
  • Bianchi, AD;
  • Wosnitza, J
  • et al.
Abstract

We report on de Haas-van Alphen (dHvA) and band-structure studies of the iridium-pnictide superconductor BaIr2P2 (Tc=2.1 K). The observed dHvA frequencies can be well understood by our band-structure calculations with two bands crossing the Fermi energy leading to a strongly corrugated Fermi-surface cylinder around the X point and a highly evolved, multiconnected Fermi surface extending over the whole Brillouin zone. The experimental effective masses are found to be considerably larger than the calculated band masses suggesting strong many-body interactions. Nevertheless, Tc remains only moderate in BaIr2P2 contrary to isostructural iron pnictides which probably is related to the largely different Fermi-surface topologies in these materials.

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