Unveiling Quadrupolar Kondo Effect in the Heavy Fermion Superconductor PrV${}_2$Al${}_{20}$

Abstract

Heavy fermion metals hosting multipolar local moments set a new stage for exploring exotic spin-orbital entangled quantum phases. In such systems, the quadrupolar Kondo effect serves as the key ingredient in the orbital-driven non-Fermi liquid (NFL) behavior and quantum critical phenomena. The cubic heavy fermion superconductor Pr$T{r}_2$Al${}_{20}$ ($Tr$: Ti, V) is a prime candidate for realizing the quadrupolar Kondo lattice. Here, we present a systematic study of the NFL phenomena in PrV${}_2$Al${}_{20}$ based on magnetoresistance (MR), magnetic susceptibility and specific heat measurements. Upon entering the NFL regime, we observe a universal scaling behavior expected for the quadrupolar Kondo lattice in PrV${}_2$Al${}_{20}$, which indicates a prominent role of the quadrupolar Kondo effect in driving the NFL behavior. Deviations from this scaling relation occur below $\sim 8$ K, accompanied by a sign change in the MR and a power-law divergence in the specific heat. This anomalous low-temperature state points to the presence of other mechanisms which are not included in the theory, such as heavy fermion coherence or multipolar quantum critical fluctuations.

arXiv comment14 pages, 4 figures

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Cited by in corpus (6)

• Critical theory of non-Fermi liquid fixed point in multipolar Kondo problem
• Channel-selective non-Fermi liquid behavior in the two-channel Kondo lattice model under a magnetic field
• Unconventional Superconductivity arising from Multipolar Kondo Interactions
• Non-Fermi liquid behavior and quantum criticality in cubic heavy fermion systems with non-Kramers multipolar local moments
• Quantum impurity model for two-stage multipolar ordering and Fermi surface reconstruction
• Non-Trivial Fixed Points and Truncated SU(4) Kondo Models in a Quasi-Quartet Multipolar Quantum Impurity Problem