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, and N.P. Armitage, “Subterahertz Momentum Drag and Violation of Matthiessen’s Rule in an Ultraclean Ferromagnetic SrRuO₃ Metallic Thin Film,” Physical Review Letters 125 (2020) 217401-1 – 217401-6.