Quantum Oscillations in Iron Pnictide Superconductors

TL;DR

This paper reviews quantum oscillation experiments in iron pnictide superconductors, revealing Fermi surface transformations across different magnetic states and discussing implications for superconductivity.

Contribution

It provides a comprehensive review of quantum oscillation data showing Fermi surface evolution in pnictides and compares it with cuprates, highlighting potential quantum critical points.

Findings

Fermi surface changes from large cylinders to smaller 3D sections

Effective mass enhancement near the quantum critical point

Similar Fermi surface evolution in cuprates and pnictides

Abstract

Insight into the electronic structure of the pnictide family of superconductors is obtained from quantum oscillation measurements. Here we review experimental quantum oscillation data that reveal a transformation from large quasi-two dimensional electron and hole cylinders in the paramagnetic overdoped members of the pnictide family to significantly smaller three-dimensional Fermi surface sections in the antiferromagnetic parent members, via a potential quantum critical point at which an effective mass enhancement is observed. Similarities with the Fermi surface evolution from the overdoped to the underdoped normal state of the cuprate superconducting family are discussed, along with the enhancement in antiferromagnetic correlations in both these classes of materials, and the potential implications for superconductivity.