2015/02/10 by Matthew D. Watson, M. D. Watson, Tatsuya Yamashita +23 · 132 citations
Materials Science · Physics and Astronomy · #Condensed matter physics #Diffraction #Electrical resistivity and conductivity #Electron #Fermi surface #Hall effect #Iron-based superconductors research #Magnetic field #Magnetoresistance #Orthorhombic crystal system #Physics #Physics of Superconductivity and Magnetism #Quantum mechanics #Quantum oscillations #Rare-earth and actinide compounds #Superconductivity #cond-mat.str-el #cond-mat.supr-con
paper · pdf · doi:10.1103/physrevlett.115.027006
published in Physical Review Letters 115(2), 027006 (American Physical Society) · Latex, 4 pages (2 figures, 1 table), and supplemental material
arxiv created 2015/02/10 · openalex publication_date 2015/07/10 · arxiv updated 2015/08/21 · openalex created_date 2016/06/24 · openalex updated_date 2026/08/06
Magnetoresistivity ρ(xx) and Hall resistivity ρ(xy) in ultrahigh magnetic fields up to 88 T are measured down to 0.15 K to clarify the multiband electronic structure in high-quality single crystals of superconducting FeSe. At low temperatures and high fields we observe quantum oscillations in both resistivity and the Hall effect, confirming the multiband Fermi surface with small volumes. We propose a novel approach to identify from magnetotransport measurements the sign of the charge carriers corresponding to a particular cyclotron orbit in a compensated metal. The observed significant differences in the relative amplitudes of the quantum oscillations between the ρ(xx) and ρ(xy) components, together with the positive sign of the high-field ρ(xy), reveal that the largest pocket should correspond to the hole band. The low-field magnetotransport data in the normal state suggest that, in addition to one hole and one almost compensated electron band, the orthorhombic phase of FeSe exhibits an additional tiny electron pocket with a high mobility.