title: Lifshitz Transitions in the Ferromagnetic Superconductor UCoGe.
abstract: We present high field magnetoresistance, Hall effect and thermopower measurements in the Ising-type ferromagnetic superconductor UCoGe. A magnetic field is applied along the easy magnetization c axis of the orthorhombic crystal. In the different experimental probes, we observed five successive anomalies at H≈4, 9, 12, 16, and 21 T. Magnetic quantum oscillations were detected both in resistivity and thermoelectric power. At most of the anomalies, significant changes of the oscillation frequencies and the effective masses have been observed, indicating successive Fermi surface instabilities induced by the strong magnetic polarization under a magnetic field.
authors.affiliation: University Grenoble Alpes, INAC-PHELIQS, F-38000 Grenoble, France.|CEA, INAC-PHELIQS, F-38000 Grenoble, France.
authors.forename: Gaël
authors.initials: G
authors.lastname: Bastien
authors.affiliation: University Grenoble Alpes, INAC-PHELIQS, F-38000 Grenoble, France.|CEA, INAC-PHELIQS, F-38000 Grenoble, France.
authors.forename: Adrien
authors.initials: A
authors.lastname: Gourgout
authors.affiliation: University Grenoble Alpes, INAC-PHELIQS, F-38000 Grenoble, France.|CEA, INAC-PHELIQS, F-38000 Grenoble, France.|IMR, Tohoku University, Oarai, Ibaraki 311-1313, Japan.
authors.forename: Dai
authors.initials: D
authors.lastname: Aoki
authors.affiliation: University Grenoble Alpes, INAC-PHELIQS, F-38000 Grenoble, France.|CEA, INAC-PHELIQS, F-38000 Grenoble, France.
authors.forename: Alexandre
authors.initials: A
authors.lastname: Pourret
authors.affiliation: CNRS, Laboratoire National des Champs Magnétiques Intenses LNCMI (UGA, UPS, INSA), UPR 3228, F-38042 Grenoble Cedex 9, France.
authors.forename: Ilya
authors.initials: I
authors.lastname: Sheikin
authors.affiliation: CNRS, Laboratoire National des Champs Magnétiques Intenses LNCMI (UGA, UPS, INSA), UPR 3228, F-38042 Grenoble Cedex 9, France.
authors.forename: Gabriel
authors.initials: G
authors.lastname: Seyfarth
authors.affiliation: University Grenoble Alpes, INAC-PHELIQS, F-38000 Grenoble, France.|CEA, INAC-PHELIQS, F-38000 Grenoble, France.
authors.forename: Jacques
authors.initials: J
authors.lastname: Flouquet
authors.affiliation: University Grenoble Alpes, INAC-PHELIQS, F-38000 Grenoble, France.|CEA, INAC-PHELIQS, F-38000 Grenoble, France.
authors.forename: Georg
authors.initials: G
authors.lastname: Knebel