Skip to main content

Subterahertz Momentum Drag and Violation of Matthiessen's Rule in an Ultraclean Ferromagnetic SrRuO3 Metallic Thin Film

Cornell Affiliated Author(s)


Y. Wang
G. Bossé
H.P. Nair
N.J. Schreiber
J.P. Ruf
B. Cheng
C. Adamo
D.E. Shai
Y. Lubashevsky
D.G. Schlom
K.M. Shen
N.P. Armitage


SrRuO3, a ferromagnet with an approximately 160 K Curie temperature, exhibits a T2-dependent dc resistivity below ≈30 K. Nevertheless, previous optical studies in the infrared and terahertz range show non-Drude dynamics at low temperatures, which seem to contradict Fermi-liquid predictions. In this work, we measure the low-frequency THz range response of thin films with residual resistivity ratios, Ï300K/Ï4K≈74. At temperatures below 30 K, we find both a sharp zero frequency mode which has a width narrower than kBT/â as well as a broader zero frequency Lorentzian that has at least an order of magnitude larger scattering. Both features have temperature dependences consistent with a Fermi liquid with the wider feature explicitly showing a T2 scaling. Above 30 K, there is a crossover to a regime described by a single Drude peak that we believe arises from strong interband electron-electron scattering. Such two channel Drude transport sheds light on reports of the violation of Matthiessen's rule and extreme sensitivity to disorder in metallic ruthenates. © 2020 American Physical Society.

Date Published


Physical Review Letters








Group (Lab)

Kyle Shen Group

Download citation