ABSTRACT
Insight into the electronic structure of the pnictide family of su-
perconductors 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.
