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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.
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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