Quasiparticle properties below coherence onset in <math xmlns="http://www.w3.org/1998/Math/MathML"><mrow><msub><mi>YbAl</mi><mn>3</mn></msub></mrow></math> nanostructures

Dale T. Lowder; Gage Eichman; Yuxin Wan; Karthik Rao; Ruiwen Xie; Hongbin Zhang; Debjoty Paul; Shouvik Chatterjee; Darrell G. Schlom; Kyle M. Shen; Emilia Morosan; Douglas Natelson

doi:10.1103/h98h-7gbl

Letter

Quasiparticle properties below coherence onset in ${YbAl}_{3}$ nanostructures

Dale T. Lowder ¹, Gage Eichman ¹, Yuxin Wan ¹, Karthik Rao ^1,2, Ruiwen Xie ³, Hongbin Zhang³, Debjoty Paul⁴, Shouvik Chatterjee⁴, Darrell G. Schlom ^5,6,7 et al.

Kyle M. Shen ^6,8, Emilia Morosan^1,9,2, and Douglas Natelson ^1,9,10,11,2

¹Department of Physics and Astronomy, Rice University, Houston, Texas 77005, USA
²Rice Center for Quantum Materials (RCQM), Rice University, Houston, Texas 77005, USA
³Institute of Materials Science, Technical University of Darmstadt, 64287 Darmstadt, Germany
⁴Department of Condensed Matter Physics and Materials Science, Tata Institute of Fundamental Research, Mumbai 400005, India
⁵Department of Materials Science and Engineering, Cornell University, Ithaca, New York 14853, USA
⁶Kavli Institute at Cornell for Nanoscale Science, Cornell University, Ithaca, New York 14853, USA
⁷Leibniz-Institut für Kristallzüchtung, Max-Born-Strasse 2, 12489 Berlin, Germany
⁸Laboratory of Atomic and Solid State Physics, Department of Physics, Cornell University, Ithaca, New York 14853, USA
⁹Smalley-Curl Institute, Rice Advanced Materials Institute, Rice University, Houston, Texas 77005, USA
¹⁰Department of Electrical and Computer Engineering, Rice University, Houston, Texas 77005, USA
¹¹Department of Materials Science and NanoEngineering, Rice University, Houston, Texas 77005, USA

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Phys. Rev. B 113, L201101 – Published 1 May, 2026

DOI: https://doi.org/10.1103/h98h-7gbl

Abstract

Mesoscopic transport measurements are underexplored as probes of quasiparticles and their properties in correlated metals. The mixed valence compound ${YbAl}_{3}$ exhibits a single-ion Kondo temperature of 670 K, while thermodynamic and transport properties (probed with specific heat, magnetic susceptibility, Hall effect, and resistivity) imply the onset of coherence of heavy fermion quasiparticles at $T^{*} \approx 37$ K. To characterize these quasiparticles, we utilize mesoscopic techniques familiar from weakly correlated conductors. In lithographically defined nanowires etched from epitaxial films, we observe weak antilocalization magnetoresistance and universal conductance fluctuations, consistent with electronic coherence lengths of tens of nanometers. Additionally, analysis of Johnson-Nyquist noise measurements as a function of bias current reveal, within the context of a range of accepted models, a significant electron-phonon energy loss that increases with decreasing temperature, a finding that we contextualize within the broader properties of ${YbAl}_{3}$ .

Physical Review B

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Quasiparticle properties below coherence onset in ${YbAl}_{3}$ nanostructures

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Quasiparticle properties below coherence onset in YbAl3 nanostructures

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Quasiparticle properties below coherence onset in ${YbAl}_{3}$ nanostructures