THz electrodynamics of mixed-valent YbAl $$_3$$ 3 and LuAl $$_3$$ 3 thin films

D. Barbalas (), S. Chatterjee, D. G. Schlom, K. M. Shen and N. P. Armitage ()
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D. Barbalas: The Johns Hopkins University
S. Chatterjee: Cornell University
D. G. Schlom: Cornell University
K. M. Shen: Cornell University
N. P. Armitage: The Johns Hopkins University

The European Physical Journal B: Condensed Matter and Complex Systems, 2021, vol. 94, issue 9, 1-8

Abstract: Abstract We present our results from time-domain THz spectroscopy measurements of thin films of mixed-valent YbAl $$_3$$ 3 and its structural analogue LuAl $$_3$$ 3 . Combined with Fourier transform infrared (FTIR) spectroscopy, the extended Drude formalism is utilized to study the quasiparticle scattering rate and effective masses in YbAl $$_3$$ 3 . We find that LuAl $$_3$$ 3 demonstrates conventional Drude transport whereas at low temperatures YbAl $$_3$$ 3 demonstrates a renormalized Drude peak and a mid-infrared (MIR) peak in the conductivity, indicative of the formation of a mass-enhanced Fermi liquid (FL). In YbAl $$_3$$ 3 the extended Drude analysis demonstrates consistency with FL behavior below the FL coherence temperature $$T^*

Date: 2021
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DOI: 10.1140/epjb/s10051-021-00191-y

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