تقرير
Negatively enhanced thermopower near a Van Hove singularity in electron-doped Sr$_2$RuO$_4$
| العنوان: | Negatively enhanced thermopower near a Van Hove singularity in electron-doped Sr$_2$RuO$_4$ |
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| المؤلفون: | Nishinakayama, Rei, Sato, Yoshiki J., Yamanaka, Takayoshi, Maeno, Yoshiteru, Yaguchi, Hiroshi, Kikugawa, Naoki, Okazaki, Ryuji |
| المصدر: | Phys. Rev. Research 6, 023222 (2024) |
| سنة النشر: | 2024 |
| المجموعة: | Condensed Matter |
| مصطلحات موضوعية: | Condensed Matter - Strongly Correlated Electrons, Condensed Matter - Materials Science, Condensed Matter - Superconductivity |
| الوصف: | 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. Comment: 10 pages, 7 figures, to be published in Phys. Rev. Research |
| نوع الوثيقة: | Working Paper |
| DOI: | 10.1103/PhysRevResearch.6.023222 |
| URL الوصول: | http://arxiv.org/abs/2404.11300 |
| رقم الأكسشن: | edsarx.2404.11300 |
| قاعدة البيانات: | arXiv |
| DOI: | 10.1103/PhysRevResearch.6.023222 |
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