Quantum oscillation studies of the Fermi surface of iron-pnictide superconductors

TL;DR

This review discusses quantum oscillation measurements in iron-pnictide superconductors, revealing detailed Fermi surface structures and mass renormalization effects that relate to their superconducting properties.

Contribution

It provides a comprehensive overview of quantum oscillation studies on iron-pnictides, especially focusing on the Fermi surface topology and mass renormalization in different compounds and doping levels.

Findings

Fermi surface topology varies with doping and composition.

Mass renormalization increases with superconducting correlations.

Quantum oscillations are observable in specific doping ranges.

Abstract

This paper reviews quantum oscillation studies of iron-pnictide superconductors and related materials. These measurements give unique information regarding the full three dimensional topology of the Fermi surfaces and the renormalisation of the quasi-particle masses. The review will cover measurements of the 122 arsenide end members, XFe_2As_2 (X = Ba, Sr, Ca) which have a spin density wave ground state, but will concentrate on the phosphide end members (LaFePO and XFe2P2) which have a paramagnetic ground state and a Fermi surface topology which is similar to the higher Tc superconducting iron-pnictides. All three of the 122 phosphides become superconducting when P is partially substituted by As, and for the BaFe2(As1-xPx)2 series de Haas-van Alphen oscillations are observable for 0:42 \leq x \leq 1 with Tc up to 25 K. The results show the changes in the Fermi surface topology and the increase in the mass renormalisation as the correlations which induce superconductivity develop.