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Fermi-surface topology of the iron pnictide LaFe2 P2

  • Author(s): Blackburn, S;
  • Prévost, B;
  • Bartkowiak, M;
  • Ignatchik, O;
  • Polyakov, A;
  • Förster, T;
  • Côté, M;
  • Seyfarth, G;
  • Capan, C;
  • Fisk, Z;
  • Goodrich, RG;
  • Sheikin, I;
  • Rosner, H;
  • Bianchi, AD;
  • Wosnitza, J
  • et al.

Published Web Location

https://doi.org/10.1103/PhysRevB.89.220505Creative Commons 'BY' version 4.0 license
Abstract

We report on a comprehensive de Haas-van Alphen (dHvA) study of the iron pnictide LaFe2P2. Our extensive density-functional band-structure calculations can well explain the measured angular-dependent dHvA frequencies. As salient feature, we observe only one quasi-two-dimensional Fermi-surface sheet; i.e., a hole-like Fermi-surface cylinder around Γ, essential for s± pairing, is missing. In spite of considerable mass enhancements due to many-body effects, LaFe2P2 shows no superconductivity. This is likely caused by the absence of any nesting between electron and hole bands. © 2014 American Physical Society.

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