We report a polarization-resolved Raman spectroscopy study of the orbital dependence of the quasiparticle properties in the prototypical multiband Fermi liquid ${\mathrm{Sr}}_2\mathrm{Ru}{\mathrm{O}}_4$. We show that the quasiparticle scattering rate displays ${\omega }^2$ dependence, as expected for a Fermi liquid. In addition, we observe a clear polarization dependence in the energy and temperature dependence of the quasiparticle scattering rate and mass, with the $d_{xz/yz}$ orbital derived quasiparticles showing significantly more robust Fermi liquid properties than the $d_{xy}$ orbital derived ones. The observed orbital dichotomy of the quasiparticles is consistent with the picture of ${\mathrm{Sr}}_2\mathrm{Ru}{\mathrm{O}}_4$ as a Hund's metal. Our study establishes Raman scattering as a powerful probe of Fermi liquid properties in correlated metals.

中文翻译：

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拉曼光谱揭示 Sr2RuO4 中费米液体性质的轨道二分法

我们报告了原型多带费米液体中准粒子特性的轨道依赖性的偏振分辨拉曼光谱研究 ${锶}_2茹{\mathrm{哦}}_4$. 我们表明准粒子散射率显示${\omega }^2$依赖，正如对费米液体的预期。此外，我们观察到准粒子散射率和质量的能量和温度依赖性明显的偏振依赖性，其中$d_{Xz/是z}$ 轨道衍生准粒子显示出比 $d_{X是}$轨道派生的。观察到的准粒子的轨道二分法与图片一致 ${锶}_2茹{\mathrm{哦}}_4$作为洪德的金属。我们的研究将拉曼散射确立为相关金属中费米液体性质的有力探针。