Complete Fermi surface in BaFe$_2$As$_2$ observed via Shubnikov-de Haas oscillation measurements on detwinned single crystals

TL;DR

This study reveals the complete three-dimensional Fermi surface of BaFe$_2$As$_2$ in its antiferromagnetic phase using Shubnikov-de Haas oscillations, contrasting previous ARPES results and providing insights into its electronic structure.

Contribution

It provides the first comprehensive observation of the full Fermi surface in BaFe$_2$As$_2$ via quantum oscillations on detwinned crystals, clarifying discrepancies with prior ARPES data.

Findings

Fermi surface consists of one hole and two electron pockets, all three-dimensional and closed.

Carrier compensation and Sommerfeld coefficient exclude large unobserved pockets.

Mass enhancement factor is between 2 and 3.

Abstract

We show that the Fermi surface (FS) in the antiferromagnetic phase of BaFe$_2$As$_2$ is composed of one hole and two electron pockets, all of which are three dimensional and closed, in sharp contrast to the FS observed by angle-resolved photoemission spectroscopy. Considerations on the carrier compensation and Sommerfeld coefficient rule out existence of unobserved FS pockets of significant sizes. A standard band structure calculation reasonably accounts for the observed FS, despite the overestimated ordered moment. The mass enhancement, the ratio of the effective mass to the band mass, is 2--3.