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THz electrodynamics of mixed-valent YbAl\(_3\) and LuAl\(_3\) thin films

  • Regular Article - Solid State and Materials
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Abstract

We present our results from time-domain THz spectroscopy measurements of thin films of mixed-valent YbAl\(_3\) and its structural analogue LuAl\(_3\). Combined with Fourier transform infrared (FTIR) spectroscopy, the extended Drude formalism is utilized to study the quasiparticle scattering rate and effective masses in YbAl\(_3\). We find that LuAl\(_3\) demonstrates conventional Drude transport whereas at low temperatures YbAl\(_3\) 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\(_3\) the extended Drude analysis demonstrates consistency with FL behavior below the FL coherence temperature \(T^* < 40\) K with the scattering rate following \(T^2\) proportionality and a moderate mass enhancement. Despite not observing a clear \(\omega ^2\) Fermi liquid-like frequency dependence the evidence is consistent with a moderate mass Fermi liquid, albeit one with a smaller mass than observed in single crystals. The extended Drude analysis also demonstrates a slow crossover between the FL state and the normal state above the \(T^*\) in YbAl\(_3\), indicative of incoherent hybridization effects persisting to high temperatures.

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Data Availability Statement

This manuscript has no associated data or the data will not be deposited. [Authors’ comment: All data that support the plots within this paper and other findings of this study are available from the corresponding author upon reasonable request.]

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Acknowledgements

The work at J.H.U was supported by the Moore Foundation EPiQS Grant No. (90088577). The work at Cornell was supported by the Air Force Office of Scientific Research Grant No. FA9550-15-1-0474 and by the National Science Foundation (Platform for the Accelerated Realization, Analysis, and Discovery of Interface Materials, PARADIM) under Cooperative Agreement No. DMR-1539918. Substrate preparation was performed in part at the Cornell NanoScale Facility, a member of the National Nanotechnology Coordinated Infrastructure (NNCI), which is supported by the NSF (Grant No. ECCS-1542081, DMR-170925).

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Authors and Affiliations

  1. Department of Physics and Astronomy, The Johns Hopkins University, Baltimore, MD, 21218, USA

    D. Barbalas & N. P. Armitage

  2. Laboratory of Atomic and Solid State Physics, Department of Physics, Cornell University, Ithaca, New York, 14853, USA

    S. Chatterjee & K. M. Shen

  3. Department of Electrical and Computer Engineering, University of California, Santa Barbara, CA, 93106, USA

    S. Chatterjee

  4. Department of Materials Science and Engineering, Cornell University, Ithaca, New York, 14853, USA

    D. G. Schlom

  5. Kavli Institute at Cornell for Nanoscale Science, Ithaca, New York, 14853, USA

    D. G. Schlom & K. M. Shen

  6. Leibniz-Institut für Kristallzüchtung, Max-Born-Str. 2, 12489, Berlin, Germany

    D. G. Schlom

Authors
  1. D. Barbalas
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  2. S. Chatterjee
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  3. D. G. Schlom
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  4. K. M. Shen
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  5. N. P. Armitage
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Contributions

DB performed the THz experiments and analyzed the data. SC grew the thin films. DB and NPA prepared the first draft, and all authors contributed to writing the manuscript.

Corresponding authors

Correspondence to D. Barbalas or N. P. Armitage.

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Barbalas, D., Chatterjee, S., Schlom, D.G. et al. THz electrodynamics of mixed-valent YbAl\(_3\) and LuAl\(_3\) thin films. Eur. Phys. J. B 94, 186 (2021). https://doi.org/10.1140/epjb/s10051-021-00191-y

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