Quasi-2D Fermi surface in the anomalous superconductor UTe2

Abstract

The heavy fermion paramagnet UTe${}_2$ exhibits numerous characteristics of spin-triplet superconductivity. Efforts to understand the microscopic details of this exotic superconductivity have been impeded by uncertainty regarding the underlying electronic structure. Here we directly probe the Fermi surface of UTe${}_2$ by measuring magnetic quantum oscillations in pristine quality crystals. We find an angular profile of quantum oscillatory frequency and amplitude that is characteristic of a quasi-2D Fermi surface, which we find is well described by two cylindrical Fermi sheets of electron- and hole-type respectively. Additionally, we find that both cylindrical Fermi sheets possess considerable undulation but negligible small-scale corrugation, which may allow for their near-nesting and therefore promote magnetic fluctuations that enhance the triplet pairing mechanism. Importantly, we find no evidence for the presence of any 3D Fermi surface sections. Our results place strong constraints on the possible symmetry of the superconducting order parameter in UTe${}_2$.

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• Molten Salt Flux Liquid Transport Method for Ultra Clean Single Crystals UTe2
• Pairing symmetries of multiple superconducting phases in UTe2: Competition between ferromagnetic and antiferromagnetic fluctuations
• Odd-Parity Quasiparticle Interference in the Superconductive Surface State of UTe2
• Thermodynamic transitions and topology of spin-triplet superconductivity: Application to UTe${}_2$
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• A quantum critical line bounds the high field metamagnetic transition surface in UTe${}_2$
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• Observation of odd-parity superconductivity in UTe2
• Reinforcement of superconductivity by quantum critical fluctuations of metamagnetism in UTe${}_2$
• Nodal superconducting gap structure and topological surface states of UTe${}_2$
• Magnetic signatures of pressure-induced multicomponent superconductivity in UTe${}_2$
• Quasiparticle interference and spectral function of the UTe${}_2$ superconductive surface band
• Majorana multipole response with magnetic point group symmetry
• Dramatic elastic response at the critical end point in UTe${}_2$
• Observation of vortex stripes in UTe${}_2$
• Two-dimensional flat band on the (011) surface of UTe${}_2$: Implication for STM measurements with a superconducting tip
• Slow magnetic quantum oscillations in the c-axis magnetoresistance of UTe${}_2$
• Visualizing the Odd-parity Superconducting Order Parameter and its Quasiparticle Surface Band in UTe2
• Pauli 'unlimited': magnetic field induced-superconductivity in UTe${}_2$
• Nodal Superconductivity of UTe${}_2$ Probed by Field-Angle-Resolved Specific Heat on a Crystal with $T_{\mathrm{c}}=2.1$ K
• Electronic correlations and spin frustration in the molecular conductors $\kappa$-(BEDT-TTF)${}_2$X probed by magnetic quantum oscillations
• Revealing isotropic abundant low-energy excitations in UTe${}_2$ through complex microwave surface impedance
• Pressure-enhanced $f$-electron orbital weighting in UTe2 mapped by quantum interferometry
• Quasiparticle Interference of Spin-Triplet Superconductors: Application to UTe${}_2$
• Electronic structure of UTe${}_2$ under pressure
• Boosted magnetic fluctuations at the onset of superconductivity in UTe${}_2$ beyond 40 T
• Evidence of intertwined pair density and charge density wave orders in UTe2
• Quasi-two-dimensional Fermi surfaces of the antiferromagnet U${}_2$RhIn${}_8$ revealed by de Haas-van Alphen measurements