| Autor: |
Taichi Terashima, Hishiro T. Hirose, Naoki Kikugawa, Shinya Uji, David Graf, Takao Morinari, Teng Wang, Gang Mu |
| Jazyk: |
angličtina |
| Rok vydání: |
2022 |
| Předmět: |
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| Zdroj: |
npj Quantum Materials, Vol 7, Iss 1, Pp 1-6 (2022) |
| Druh dokumentu: |
article |
| ISSN: |
2397-4648 |
| DOI: |
10.1038/s41535-022-00470-6 |
| Popis: |
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 c axis. We measured the longitudinal and Hall resistivities in CaFeAsF with the electrical current in the a b plane in magnetic fields up to 45 T applied along the c 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 ν = 2 for both electrons and holes at these high field strengths, resulting in a total filling factor ν = ν hole − ν electron = 0. We therefore argue that the ν = 0 quantum Hall state emerges under these conditions. |
| Databáze: |
Directory of Open Access Journals |
| Externí odkaz: |
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