Missing spectral weight in a heavy-fermion system far above Néel temperature
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arXiv
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| Autori principali: | , , , , , , , , |
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| Natura: | Preprint |
| Pubblicazione: |
2024
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| _version_ | 1866915100201320448 |
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| author | Li, Jingwen Priyadarshi, Debankit Yang, Chia-Jung Pohl, Ulli Stockert, Oliver von Löhneysen, Hilbert Pal, Shovon Fiebig, Manfred Kroha, Johann |
| author_facet | Li, Jingwen Priyadarshi, Debankit Yang, Chia-Jung Pohl, Ulli Stockert, Oliver von Löhneysen, Hilbert Pal, Shovon Fiebig, Manfred Kroha, Johann |
| contents | The competition between the Kondo spin-screening effect and the Ruderman-Kittel-Kasuya-Yosida (RKKY) interaction in heavy-fermion systems drives the quantum phase transition between the magnetically ordered and the heavy-Fermi-liquid ground states. Despite intensive investigations of heavy quasiparticles on the Kondo-screened side of the quantum phase transition and of their breakdown at the quantum critical point, the magnetically ordering side has not systematically been studied. Using terahertz time-domain spectroscopy, we report a suppression of the Kondo quasiparticle weight in CeCu$_{6-x}$Au$_x$ samples on the antiferromagnetic side of the quantum phase transition at temperatures as much as two orders of magnitude above the Néel temperature $T_\text{N}$. With our systematic investigations into the high-temperature, paramagnetic region on the antiferromagnetic side of the phase diagram of CeCu$_{6-x}$Au$_x$, i.e., with $x =$ 0.2, 0.3, and 0.5, we show that the suppression results from a quantum frustration effect induced by the temperature-independent RKKY interaction. Hence, our results emphasize that besides critical fluctuations, the RKKY interaction may play an important role in the quantum-critical scenario. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2408_07345 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | Missing spectral weight in a heavy-fermion system far above Néel temperature Li, Jingwen Priyadarshi, Debankit Yang, Chia-Jung Pohl, Ulli Stockert, Oliver von Löhneysen, Hilbert Pal, Shovon Fiebig, Manfred Kroha, Johann Strongly Correlated Electrons The competition between the Kondo spin-screening effect and the Ruderman-Kittel-Kasuya-Yosida (RKKY) interaction in heavy-fermion systems drives the quantum phase transition between the magnetically ordered and the heavy-Fermi-liquid ground states. Despite intensive investigations of heavy quasiparticles on the Kondo-screened side of the quantum phase transition and of their breakdown at the quantum critical point, the magnetically ordering side has not systematically been studied. Using terahertz time-domain spectroscopy, we report a suppression of the Kondo quasiparticle weight in CeCu$_{6-x}$Au$_x$ samples on the antiferromagnetic side of the quantum phase transition at temperatures as much as two orders of magnitude above the Néel temperature $T_\text{N}$. With our systematic investigations into the high-temperature, paramagnetic region on the antiferromagnetic side of the phase diagram of CeCu$_{6-x}$Au$_x$, i.e., with $x =$ 0.2, 0.3, and 0.5, we show that the suppression results from a quantum frustration effect induced by the temperature-independent RKKY interaction. Hence, our results emphasize that besides critical fluctuations, the RKKY interaction may play an important role in the quantum-critical scenario. |
| title | Missing spectral weight in a heavy-fermion system far above Néel temperature |
| topic | Strongly Correlated Electrons |
| url | https://arxiv.org/abs/2408.07345 |