Anomalous High-Field Magnetotransport in CaFeAsF due to the Quantum Hall Effect
arXiv:2107.10460 · doi:10.1038/s41535-022-00470-6
Abstract
CaFeAsF is an iron-based superconductor parent compound whose Fermi surface is quasi-two dimensional, composed of Dirac-electron and Schrödinger-hole cylinders elongated along the axis. We measured the longitudinal and Hall resistivities in CaFeAsF with the electrical current in the plane in magnetic fields up to 45 T applied along the axis and obtained the corresponding conductivities via tensor inversion. We found that both the longitudinal and Hall conductivities approached zero above 40 T as the temperature was lowered to 0.4 K. Our analysis indicates that the Landau-level filling factor is = 2 for both electrons and holes at these high field strengths, resulting in a total filling factor = = 0. We therefore argue that the = 0 quantum Hall state emerges under these conditions.
18 pages, 1 table, 4 figures
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