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Strange metal behavior emerges across a wide range of material platforms and remains a central open problem in correlated quantum matter [1]. Beyond the hallmark linear-in-temperature electrical resistivity, it is characterized by entropy accumulation, a discontinuous change in Fermi volume, and energy-over-temperature scaling in dynamical susceptibilities [2]. Recent studies suggest that kagome metals, hosting flat electronic bands near the Fermi level, can exhibit magnetic-field-tunable strange metal behavior even in the absence of f electrons [3]. The heavy fermion compound Ce3Pd20Si6 provides an ideal platform to investigate quantum criticality beyond the Landau–Ginzburg–Wilson framework, including access to fractional critical exponents and emerging concepts such as multipartite entanglement [4,5]. Here, we present inelastic neutron scattering measurements at a strange-metal quantum critical point in Ce3Pd20Si6. Our analysis reveals dynamical scaling behavior, quantifies the entanglement depth via the quantum Fisher information density fQ, and establishes a direct comparison with quantum Monte Carlo simulations. These results highlight intriguing connections between heavy-fermion systems and flat-band materials [3,6].
[1] Checkelsky, J. G., et al. Flat bands, strange metals, and the Kondo effect, Nat. Rev. Mater. 9, 509–526 (2024).
[2] Paschen, S. & Si, Q. Quantum phases driven by strong correlations, Nat. Rev. Phys. 3, 9–26 (2021).
[3] Ye, L., et al. Hopping frustration-induced flat band and strange metallicity in a kagome metal. Nat. Phys. 20, 610–614 (2024).
[4] Martelli, V., et al. Sequential localization of a complex electron fluid, Proc. Natl. Acad. Sci. U.S.A. 116, 17701 (2019).
[5] Hauke, P., et al. Measuring multipartite entanglement through dynamic susceptibilities, Nat. Phys. 12, 778–782 (2016).
[6] Mazza, F., Biswas, S., et al. Quantum Fisher information in a strange metal, arXiv:2403.12779 to appear in Nat. Phys. (2026).