Anisotropic non-Fermi liquid and dynamical Planckian scaling of a quasi-kagome Kondo lattice system
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/k B T. However, the...
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| Format: | Article |
| Language: | English |
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Nature Portfolio
2025-08-01
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| Series: | npj Quantum Materials |
| Online Access: | https://doi.org/10.1038/s41535-025-00797-w |
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| author | Shin-ichi Kimura Muhammad Frassetia Lubis Hiroshi Watanabe Yasuyuki Shimura Toshiro Takabatake |
| author_facet | Shin-ichi Kimura Muhammad Frassetia Lubis Hiroshi Watanabe Yasuyuki Shimura Toshiro Takabatake |
| author_sort | Shin-ichi Kimura |
| collection | DOAJ |
| description | 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/k B T. 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 ℏ ω/k B T 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. |
| format | Article |
| id | doaj-art-c87e6d09a0ba4cc3b110621da0e8ec4b |
| institution | Kabale University |
| issn | 2397-4648 |
| language | English |
| publishDate | 2025-08-01 |
| publisher | Nature Portfolio |
| record_format | Article |
| series | npj Quantum Materials |
| spelling | doaj-art-c87e6d09a0ba4cc3b110621da0e8ec4b2025-08-20T04:01:42ZengNature Portfolionpj Quantum Materials2397-46482025-08-011011610.1038/s41535-025-00797-wAnisotropic non-Fermi liquid and dynamical Planckian scaling of a quasi-kagome Kondo lattice systemShin-ichi Kimura0Muhammad Frassetia Lubis1Hiroshi Watanabe2Yasuyuki Shimura3Toshiro Takabatake4Graduate School of Frontier Biosciences, The University of OsakaDepartment of Physics, Graduate School of Science, The University of OsakaGraduate School of Frontier Biosciences, The University of OsakaDepartment of Quantum Matter, AdSE, Hiroshima UniversityDepartment of Quantum Matter, AdSE, Hiroshima UniversityAbstract 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/k B T. 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 ℏ ω/k B T 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.https://doi.org/10.1038/s41535-025-00797-w |
| spellingShingle | Shin-ichi Kimura Muhammad Frassetia Lubis Hiroshi Watanabe Yasuyuki Shimura Toshiro Takabatake Anisotropic non-Fermi liquid and dynamical Planckian scaling of a quasi-kagome Kondo lattice system npj Quantum Materials |
| title | Anisotropic non-Fermi liquid and dynamical Planckian scaling of a quasi-kagome Kondo lattice system |
| title_full | Anisotropic non-Fermi liquid and dynamical Planckian scaling of a quasi-kagome Kondo lattice system |
| title_fullStr | Anisotropic non-Fermi liquid and dynamical Planckian scaling of a quasi-kagome Kondo lattice system |
| title_full_unstemmed | Anisotropic non-Fermi liquid and dynamical Planckian scaling of a quasi-kagome Kondo lattice system |
| title_short | Anisotropic non-Fermi liquid and dynamical Planckian scaling of a quasi-kagome Kondo lattice system |
| title_sort | anisotropic non fermi liquid and dynamical planckian scaling of a quasi kagome kondo lattice system |
| url | https://doi.org/10.1038/s41535-025-00797-w |
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