title: Dichotomy between the Hole and Electron Behavior in Multiband Superconductor FeSe Probed by Ultrahigh Magnetic Fields.
abstract: 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.
authors.affiliation: Clarendon Laboratory, Department of Physics, University of Oxford, Parks Road, Oxford OX1 3PU, United Kingdom.
authors.forename: M D
authors.initials: MD
authors.lastname: Watson
authors.affiliation: Department of Physics, Kyoto University, Sakyo-ku, Kyoto 606-8501, Japan.
authors.forename: T
authors.initials: T
authors.lastname: Yamashita
authors.affiliation: Department of Physics, Kyoto University, Sakyo-ku, Kyoto 606-8501, Japan.
authors.forename: S
authors.initials: S
authors.lastname: Kasahara
authors.affiliation: Laboratoire National des Champs Magnétiques Intenses (LNCMI-EMFL), UPR 3228, CNRS-UJF-UPS-INSA, 143 Avenue de Rangueil, 31400 Toulouse, France.
authors.forename: W
authors.initials: W
authors.lastname: Knafo
authors.affiliation: Laboratoire National des Champs Magnétiques Intenses (LNCMI-EMFL), UPR 3228, CNRS-UJF-UPS-INSA, 143 Avenue de Rangueil, 31400 Toulouse, France.
authors.forename: M
authors.initials: M
authors.lastname: Nardone
authors.affiliation: Laboratoire National des Champs Magnétiques Intenses (LNCMI-EMFL), UPR 3228, CNRS-UJF-UPS-INSA, 143 Avenue de Rangueil, 31400 Toulouse, France.
authors.forename: J
authors.initials: J
authors.lastname: Béard
authors.affiliation: Institut fur Festkörperphysik, Karlsruhe Institute of Technology, 76021 Karlsruhe, Germany.
authors.forename: F
authors.initials: F
authors.lastname: Hardy
authors.affiliation: High Field Magnet Laboratory (HFML-EMFL), Radboud University, 6525 ED Nijmegen, Netherlands.
authors.forename: A
authors.initials: A
authors.lastname: McCollam
authors.affiliation: Clarendon Laboratory, Department of Physics, University of Oxford, Parks Road, Oxford OX1 3PU, United Kingdom.
authors.forename: A
authors.initials: A
authors.lastname: Narayanan
authors.affiliation: Clarendon Laboratory, Department of Physics, University of Oxford, Parks Road, Oxford OX1 3PU, United Kingdom.
authors.forename: S F
authors.initials: SF
authors.lastname: Blake
authors.affiliation: Institut fur Festkörperphysik, Karlsruhe Institute of Technology, 76021 Karlsruhe, Germany.
authors.forename: T
authors.initials: T
authors.lastname: Wolf
authors.affiliation: Clarendon Laboratory, Department of Physics, University of Oxford, Parks Road, Oxford OX1 3PU, United Kingdom.
authors.forename: A A
authors.initials: AA
authors.lastname: Haghighirad
authors.affiliation: Institut fur Festkörperphysik, Karlsruhe Institute of Technology, 76021 Karlsruhe, Germany.
authors.forename: C
authors.initials: C
authors.lastname: Meingast
authors.affiliation: School of Physics and Astronomy, University of Birmingham, Edgbaston, Birmingham B15 2TT, United Kingdom.
authors.forename: A J
authors.initials: AJ
authors.lastname: Schofield
authors.affiliation: Institut fur Festkörperphysik, Karlsruhe Institute of Technology, 76021 Karlsruhe, Germany.
authors.forename: H v
authors.initials: Hv
authors.lastname: Löhneysen
authors.affiliation: Department of Physics, Kyoto University, Sakyo-ku, Kyoto 606-8501, Japan.
authors.forename: Y
authors.initials: Y
authors.lastname: Matsuda
authors.affiliation: Clarendon Laboratory, Department of Physics, University of Oxford, Parks Road, Oxford OX1 3PU, United Kingdom.
authors.forename: A I
authors.initials: AI
authors.lastname: Coldea
authors.affiliation: Department of Physics, Kyoto University, Sakyo-ku, Kyoto 606-8501, Japan.|Department of Advanced Materials Science, University of Tokyo, Kashiwa, Chiba 277-8561, Japan.
authors.forename: T
authors.initials: T
authors.lastname: Shibauchi