Negatively enhanced thermopower near a Van Hove singularity in electron-doped Sr$_2$RuO$_4$
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arXiv
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| Auteurs principaux: | , , , , , , |
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| Format: | Preprint |
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2024
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| _version_ | 1866910466824994816 |
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| author | Nishinakayama, Rei Sato, Yoshiki J. Yamanaka, Takayoshi Maeno, Yoshiteru Yaguchi, Hiroshi Kikugawa, Naoki Okazaki, Ryuji |
| author_facet | Nishinakayama, Rei Sato, Yoshiki J. Yamanaka, Takayoshi Maeno, Yoshiteru Yaguchi, Hiroshi Kikugawa, Naoki Okazaki, Ryuji |
| contents | The layered perovskite Sr$_2$RuO$_4$ serves as a model material of the two-dimensional (2D) Fermi liquid but also exhibits various emergent phenomena including the non-Fermi-liquid (NFL) behavior under external perturbations such as uniaxial pressure and chemical substitutions. Here we present the thermoelectric transport of electron-doped system Sr$_{2-y}$La$_{y}$RuO$_4$, in which a filling-induced Lifshitz transition occurs at the Van Hove singularity (VHS) point of $y\approx 0.2$. We find that the sign of the low-temperature thermopower becomes negative only near the VHS point, where the NFL behavior has been observed in the earlier work. This observation is incompatible with either a numerical calculation within a constant relaxation-time approximation or a toy-model calculation for the 2D Lifshitz transition adopting an elastic carrier scattering. As a promising origin of the observed negatively enhanced thermopower, we propose a skewed NFL state, in which an inelastic scattering with a considerable odd-frequency term plays a crucial role to negatively enhance the thermopower. |
| format | Preprint |
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arxiv_https___arxiv_org_abs_2404_11300 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | Negatively enhanced thermopower near a Van Hove singularity in electron-doped Sr$_2$RuO$_4$ Nishinakayama, Rei Sato, Yoshiki J. Yamanaka, Takayoshi Maeno, Yoshiteru Yaguchi, Hiroshi Kikugawa, Naoki Okazaki, Ryuji Strongly Correlated Electrons Materials Science Superconductivity The layered perovskite Sr$_2$RuO$_4$ serves as a model material of the two-dimensional (2D) Fermi liquid but also exhibits various emergent phenomena including the non-Fermi-liquid (NFL) behavior under external perturbations such as uniaxial pressure and chemical substitutions. Here we present the thermoelectric transport of electron-doped system Sr$_{2-y}$La$_{y}$RuO$_4$, in which a filling-induced Lifshitz transition occurs at the Van Hove singularity (VHS) point of $y\approx 0.2$. We find that the sign of the low-temperature thermopower becomes negative only near the VHS point, where the NFL behavior has been observed in the earlier work. This observation is incompatible with either a numerical calculation within a constant relaxation-time approximation or a toy-model calculation for the 2D Lifshitz transition adopting an elastic carrier scattering. As a promising origin of the observed negatively enhanced thermopower, we propose a skewed NFL state, in which an inelastic scattering with a considerable odd-frequency term plays a crucial role to negatively enhance the thermopower. |
| title | Negatively enhanced thermopower near a Van Hove singularity in electron-doped Sr$_2$RuO$_4$ |
| topic | Strongly Correlated Electrons Materials Science Superconductivity |
| url | https://arxiv.org/abs/2404.11300 |