Fermi-surface topology of the iron pnictideLaFe2P2

S Blackburn,M Bartkowiak,Z Fisk,M Côté,C Capan,G Seyfarth,T Förster,O Ignatchik,A D Bianchi,A Polyakov,R G Goodrich,I Sheikin,B Prévost,H Rosner,J Wosnitza

doi:10.1103/physrevb.89.220505

Abstract

We report on a comprehensive de Haas--van Alphen (dHvA) study of the iron pnictide LaFe$_2$P$_2$. 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 $\Gamma$, essential for $s_\pm$ pairing, is missing. In spite of considerable mass enhancements due to many-body effects, LaFe$_2$P$_2$ shows no superconductivity. This is likely caused by the absence of any nesting between electron and hole bands.

Highlights

We report on a comprehensive de Haas–van Alphen study of the iron pnictide LaFe2P2
Important results on the topology of the Fermi surfaces and many-body mass enhancements have been obtained already, but more information is needed for gaining a coherent picture on the band-structure properties relevant for superconductivity in these materials
We report on a detailed de Haas–van Alphen study combined with band-structure calculations of the 122 iron phosphide LaFe2P2

Summary

Introduction

We report on a comprehensive de Haas–van Alphen (dHvA) study of the iron pnictide LaFe2P2. Fermi-surface topology of the iron pnictide LaFe2P2 Our extensive density-functional band-structure calculations can well explain the measured angular-dependent dHvA frequencies.

Results

Conclusion