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The layered perovskite Sr2RuO4 serves 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 pertur- bations such as uniaxial pressure and chemical substitutions. Here we present the thermoelectric transport measurement 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 ~ 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 to 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 an origin of the present results, 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.

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• Creative Commons BY Attribution 4.0 International
  

Keyword: Sr2RuO4, Non Fermi liquid, Lifshitz transition, Van Hove singularity, Thermopower

Date published: 2024-05-31

Publisher: American Physical Society (APS)

Journal:

• Physical Review Research (ISSN: 26431564) vol. 6 issue. 2 023222

Funding:

• Japan Society for the Promotion of Science 17H06136
• Japan Society for the Promotion of Science 21H01033
• Japan Society for the Promotion of Science 22H01166
• Japan Society for the Promotion of Science 22H01168
• Japan Society for the Promotion of Science 22K19093

Manuscript type: Publisher's version (Version of record)

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First published URL: https://doi.org/10.1103/physrevresearch.6.023222

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Updated at: 2024-06-03 12:30:13 +0900

Published on MDR: 2024-06-03 12:30:13 +0900