2025-08-20 大阪大学
図1. CeRhSn上のもつれた重い電子の概念図
＜関連情報＞
- https://resou.osaka-u.ac.jp/ja/research/2025/20250820_2
- https://www.sci.osaka-u.ac.jp/ja/wp-content/uploads/2025/08/PR_Kimura.pdf
- https://www.nature.com/articles/s41535-025-00797-w
異方性非フェルミ液体と準カゴメ近藤格子系の動的プランクスケール化 Anisotropic non-Fermi liquid and dynamical Planckian scaling of a quasi-kagome Kondo lattice system
Shin-ichi Kimura,Muhammad Frassetia Lubis,Hiroshi Watanabe,Yasuyuki Shimura & Toshiro Takabatake
npj Quantum Materials Published:05 August 2025
DOI:https://doi.org/10.1038/s41535-025-00797-w
Abstract
At the quantum critical point of correlated materials, a non-Fermi liquid state appears where electron correlations continuously develop to very low temperatures. The relaxation time of the interacted electrons, namely quasiparticles, is scaled with the Planckian time, ℏ/kBT. However, there is a debate over whether heavy-fermion systems can obey the Planckian time. In the optical conductivity spectra, the Drude response will appear as the scaling of ℏω/kBT as the dynamical Planckian scaling (DPS). Here, we report the non-Fermi liquid behavior in the Drude response of a candidate for such materials, the quasi-kagome Kondo lattice CeRhSn. Even though the material shows a strong valence fluctuation, renormalized Drude responses observed at the photon energy below 100 meV are characterized by non-Fermi-liquid-like scattering rate 1/τ. The heavy carriers’ Drude response only for the Ce quasi-kagome plane obeyed DPS below 80 K, suggesting the anisotropic quantum criticality with the strong c–f hybridization.
