超净铁磁SrRuO $_3$金属薄膜中的亚太赫兹动量阻力和Matthiessen规则的违反
Sub-THz momentum drag and violation of Matthiessen's rule in an ultraclean ferromagnetic SrRuO$_3$ metallic thin film
摘要：
SrRuO $_3$是一种居里温度约为160 K的铁磁体，在低于$\approx$ 30 K时，其直流电阻率与$T^2$有关.然而，以前在红外和太赫兹范围内的光学研究表明，在低温下的非德鲁德动力学似乎与长寿命准粒子的费米液体图片相矛盾。在这项工作中，我们测量的低频太赫兹范围内的响应薄膜的剩余电阻率比，$ρ_{300K}/ ρ_{4K} \approx$ 74。这样的低无序样品允许在低频传输的电子-电子相互作用的影响前所未有的外观。在低于30 K的温度下，我们发现了一个非常尖锐的零频率模式，其宽度比$k_BT/\hbar$窄，以及更广泛的零频率洛伦兹，至少有一个数量级更大的散射率。这两个功能的温度依赖性与费米液体与更广泛的功能明确显示T $^2$缩放一致。这种两个德鲁德运输揭示了以前的报告违反Mathielssen的规则和极端敏感性，以无序的金属双烯酸盐。我们考虑了一些可能性的起源的两个功能的光学电导率，包括多带效应，所产生的动量守恒带间散射和近似守恒的伪动量，所产生的准一维费米表面。
英文摘要：
SrRuO$_3$, a ferromagnet with an approximately 160\,K Curie temperature, exhibits a $T^2$ dependent dc resistivity below $\approx$ 30 K. Nevertheless, previous optical studies in the infrared and terahertz range show non-Drude dynamics at low temperatures which seem to contradict a Fermi-liquid picture with long-lived quasiparticles. In this work, we measure the low-frequency THz range response of thin films with residual resistivity ratios, $ρ_{300K}/ ρ_{4K} \approx$ 74. Such low disorder samples allow an unprecedented look at the effects of electron-electron interactions on low-frequency transport. At temperatures below 30 K, we found both a very sharp zero-frequency mode which has a width narrower than $k_BT/\hbar$ as well as a broader zero frequency Lorentzian that has at least an order of magnitude larger scattering rate. Both features have temperature dependencies consistent with a Fermi-liquid with the wider feature explicitly showing a T$^2$ scaling. Such two -Drude transport sheds light on previous reports of the violation of Mathielssen's rule and extreme sensitivity to disorder in metallic ruthenates. We consider a number of possibilities for the origin of the two feature optical conductivity including multiband effects that arise from momentum conserving interband scattering and the approximate conservation of a pseudo-momentum that arises from quasi-1D Fermi surfaces.
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