First Observation of Quantum Oscillations in the Ferromagnetic Superconductor UCoGe

Abstract

We succeeded in growing high quality single crystals of the ferromagnetic superconductor UCoGe and measured the magnetoresistance at fields up to 34T. The Shubnikov-de Haas signal was observed for the first time in a U-111 system (UTGe, UTSi, T: transition metal). A small pocket Fermi surface (F~1kT) with large cyclotron effective mass 25m0 was detected at high fields above 22T, implying that UCoGe is a low carrier system accompanyed with heavy quasi-particles. The observed frequency decreases with increasing fields, indicating that the volume of detected Fermi surface changes nonlinearly with field. The cyclotron mass also decreases, which is consistent with the decrease of the A coefficient of resistivity.

5 pages, 5 figures, accepted for publication in J. Phys. Soc. Jpn

References in corpus (6)

• Similarity of Fermi Surface in the Hidden Order State and in the Antiferromagnetic State of URu2Si2
• Unusual upper critical field of the ferromagnetic superconductor UCoGe
• Magnetic-Field Dependence of the YbRh2Si2 Fermi Surface
• Field Re-entrant Superconductivity Induced by the Enhancement of Effective Mass in URhGe
• Possible Phase Transition Deep Inside the Hidden Order Phase of Ultraclean URu2Si2
• Pressure-temperature phase diagram of ferromagnetic superconductors

Cited by in corpus (22)

• Ferromagnetism and Superconductivity in Uranium Compounds
• High-Field Superconductivity at an Electronic Topological Transition in URhGe
• Superconductivity and Ferromagnetic Quantum Criticality in Uranium Compounds
• Heavy fermions in high magnetic field
• High-field moment polarization in the ferromagnetic superconductor UCoGe
• Anisotropic critical magnetic fluctuations in the ferromagnetic superconductor UCoGe
• Superconductivity Reinforced by Magnetic Field and the Magnetic Instability in Uranium Ferromagnets
• Properties of Ferromagnetic Superconductors
• Symmetry protected line nodes in non-symmorphic magnetic space groups: Applications to UCoGe and UPd${}_2$Al${}_3$
• Magnon radiation by moving Abrikosov vortices in ferromagnetic superconductors and superconductor-ferromagnet multilayers
• Lifshitz Transitions in the Ferromagnetic Superconductor UCoGe
• Interplay of magnetism, Fermi surface reconstructions, and hidden-order in the heavy-fermion material URu${}_2$Si${}_2$
• Electronic structures of ferromagnetic superconductors ${\mathrm{UGe}}_2$ and $\mathrm{UCoGe}$ studied by angle-resolved photoelectron spectroscopy
• Assessment of the U and Co magnetic moments in UCoGe by X-ray magnetic circular dichroism
• Fermi Surface Instabilities in Ferromagnetic Superconductor URhGe
• Thermoelectricity of the Ferromagnetic Superconductor UCoGe
• Anomalous angular dependence of the upper critical induction of orthorhombic ferromagnetic superconductors with completely broken p-wave symmetry
• Angular variation of the magnetoresistance of the superconducting ferromagnet UCoGe
• Field-induced Phenomena in Ferromagnetic Superconductors UCoGe and URhGe
• Electron-beam Floating-zone Refined UCoGe
• First-order chiral to non-chiral transition in the angular dependence of the upper critical induction of the Scharnberg-Klemm $p$-wave pair state
• Anisotropic field response of specific heat for a ferromagnetic superconductor UCoGe in magnetic fields