Fermi surface of superconducting LaFePO determined by quantum oscillations

Coldea, A. I.; Fletcher, J. D.; Carrington, A.; Analytis, J. G.; Bangura, A. F.; Chu, J. -H.; Erickson, A. S.; Fisher, I. R.; Hussey, N. E.; McDonald, R. D.

Fermi surface of superconducting LaFePO determined by quantum oscillations

Authors

Description

We report extensive measurements of quantum oscillations in the normal state of the Fe-based superconductor LaFePO, (Tc ~ 6 K) using low temperature torque magnetometry and transport in high static magnetic fields (45 T). We find that the Fermi surface is in broad agreement with the band-structure calculations with the quasiparticle mass enhanced by a factor ~2. The quasi-two dimensional Fermi surface consist of nearly-nested electron and hole pockets, suggesting proximity to a spin/charge density wave instability.
to appear in Physical Review Letters