[16p-WL2_401-1~15] 9.4 Thermoelectric conversion

2:15 PM - 2:30 PM JST(5:15 AM - 5:30 AM UTC)

[16p-WL2_401-4] Enhancement of the Seebeck Coefficient Induced by Local Strain in the Sr₂RuO₄-Ru Eutectic System

〇Takeru Ito¹, Okazaki Ryuji¹, Shogo Yoshida¹, Hiroshi Yaguchi¹ (1.Tokyo Univ. of Science)

Keywords:

Eutectic System,Local Strain,Superconductivity

The Seebeck coefficient is sensitive to the asymmetry of electronic states near the Fermi energy and can be enhanced when a van Hove singularity lies close to the Fermi energy. In Sr₂RuO₄, uniaxial strain shifts the van Hove singularity toward the Fermi energy. In the Sr₂RuO₄-Ru eutectic system, local strain is expected to arise internally without external pressure, potentially bringing the van Hove singularity closer to the Fermi energy in a similar way. However, it is difficult to quantitatively evaluate the strain at the interface between Ru and Sr₂RuO₄, and the impact of Ru-induced local strain on transport properties remains unclear. Here, we measure the Seebeck coefficient of Sr₂RuO₄-Ru eutectic system, evaluate interfacial strain by finite element analysis, and quantitatively discuss the results using transport calculations.