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Magnetic Field-Tuning Quantum Criticality and Fermi Surface Reconstruction in the Multipolar Kondo System PrV2Al20

Strongly interacting electrons render exotic quantum phases that constitute the central themes of quantum materials research. The prominent examples include non-Fermi liquid (NFL) states that defy descriptions based on the Landau quasiparticle paradigm and novel superconductivity beyond the Bardeen–Cooper–Schrieffer (BCS) theory. Recent studies have demonstrated that electron orbitals and their interplay with spin degrees of freedom may play a key role in realizing the rich phase diagram of strongly correlated electron systems. However, novel quantum states originating solely from orbital effects remain underexplored. The multipolar Kondo material PrV2Al20 features substantial Kondo entanglement between multipolar local moments and conduction electrons, offering an ideal stage for exploring the purely orbital-driven NFL and quantum criticality. In this talk, I will focus on the magnetic field-tuning quantum criticality in PrV2Al20. I will discuss how the novel NFL state and the Fermi surface evolve across the quantum critical regime based on our recent low-temperature transport and thermodynamic measurements.

Host: Stephen Julian
Event series  QO/AMO SeminarsToronto Quantum Matter Seminars