Fermi surface of superconducting LaFePO determined by quantum oscillations

Abstract

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

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• Strength of correlations in pnictides and its assessment by theoretical calculations and spectroscopy experiments
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• Multiorbital Effects on Antiferromagnetism in Fe Pnictides
• Quantum Oscillation Studies of the Fermi Surface of LaFePO
• Fermi surface in BaNi${}_2$P${}_2$
• Correlated electrons in Fe-As compounds: a quantum chemical perspective
• Effect of Fermi Surface Topology on Inter-Layer Magnetoresistance in Layered Multiband Systems: Application to LaFeAsO1-xFx