Observation of quantum oscillations near the Mott-Ioffe-Regel limit in CaAs3

Abstract

The Mott-Ioffe-Regel limit sets the lower bound of carrier mean free path for coherent quasiparticle transport. Metallicity beyond this limit is of great interest because it is often closely related to quantum criticality and unconventional superconductivity. Progress along this direction mainly focuses on the strange-metal behaviors originating from the evolution of quasiparticle scattering rate such as linear-in-temperature resistivity, while the quasiparticle coherence phenomena in this regime are much less explored due to the short mean free path at the diffusive bound. Here we report the observation of quantum oscillations from Landau quantization near the Mott-Ioffe-Regel limit in CaAs3. Despite the insulator-like temperature dependence of resistivity, CaAs3 presents giant magnetoresistance and prominent Shubnikov-de Haas oscillations from Fermi surfaces, indicating highly coherent band transport. In contrast, the quantum oscillation is absent in the magnetic torque. The quasiparticle effective mass increases systematically with magnetic fields, manifesting a much larger value than the expectation given by magneto-infrared spectroscopy. It suggests a strong many-body renormalization effect near Fermi surface. We find that these unconventional behaviors may be explained by the interplay between the mobility edge and the van Hove singularity, which results in the formation of coherent cyclotron orbits emerging at the diffusive bound. Our results call for further study on the electron correlation effect of the van Hove singularity.

arXiv comment18 pages, 5 figures

References in corpus (39)

• Quantum ESPRESSO: a modular and open-source software project for quantum simulations of materials
• Ultrahigh mobility and giant magnetoresistance in the Dirac semimetal Cd${}_3$As${}_2$
• Tunable Phase Boundaries and Ultra-Strong Coupling Superconductivity in Mirror Symmetric Magic-Angle Trilayer Graphene
• Two-dimensional Dirac fermions in a topological insulator: transport in the quantum limit
• Topological origin of subgap conductance in insulating bilayer graphene
• Saturation of electrical resistivity
• Theory of universal incoherent metallic transport
• Chern Insulators and Topological Flat-bands in Magic-angle Twisted Bilayer Graphene
• Universality of the Mott-Ioffe-Regel limit in metals
• Unconventional Fermi surface in an insulating state
• Topological Nodal Line Semimetals in CaP3 family of materials
• Superconductivity in the topological semimetal YPtBi
• Quasiparticle mass enhancement approaching optimal doping in a high-Tc superconductor
• Observation of an intrinsic bandgap and Landau level renormalization in graphene/boron-nitride heterostructures
• Strange metal behavior in a pure ferromagnetic Kondo lattice
• Critical doping for the onset of a two-band superconducting ground state in SrTiO${}_{3-\delta }$
• Unconventional mass enhancement around the Dirac nodal loop in ZrSiS
• Magnetoresistance near a quantum critical point
• Tantalum Monoarsenide: an Exotic Compensated Semimetal
• Electron scattering in tantalum monoarsenide
• Quantum Oscillations of Electrical Resistivity in an Insulator
• Magneto-optical signature of massless Kane electrons in Cd3As2
• Quasiparticle mass enhancement close to the quantum critical point in BaFe${}_2$(As${}_{1-x}$P${}_x$)${}_2$
• The Strange Metal State of the Electron-Doped Cuprates
• Anomalous conductivity tensor in the Dirac semimetal Na_3Bi
• Linear-in temperature resistivity from an isotropic Planckian scattering rate
• Spectroscopic evidence for bulk-band inversion and three-dimensional massive Dirac fermions in ZrTe5
• Electron-hole compensation effect between topologically trivial electrons and nontrivial holes in NbAs
• Test for interlayer coherence in a quasi-two-dimensional superconductor
• A strange metal in a bosonic system
• A single nodal loop of accidental degeneracies in minimal symmetry: triclinic CaAs${}_3$
• Evidence for a Dirac nodal-line semimetal in SrAs${}_3$
• Observation of topological nodal-loop state in RAs3 (R = Ca, Sr)
• Lifshitz transition and van Hove singularity in a Topological Dirac Semimetal
• Many-particle effects in the cyclotron resonance of encapsulated monolayer graphene
• Deviation from the Fermi-Liquid Transport Behavior in the Vicinity of a Van Hove Singularity
• The Hall number across a van Hove singularity
• Modifications of the Lifshitz-Kosevich formula in two-dimensional Dirac systems
• Valley and Zeeman Splittings in Multilayer Epitaxial Graphene Revealed by Circular Polarization Resolved Magneto-infrared Spectroscopy