THz Spectroscopy of the Heavy Fermion Metal YbAl3

ORAL

Abstract

Due to the interaction of local moment physics and mixed-valence behavior in Yb compounds, Yb heavy fermion compounds have not demonstrated the same range of phenomena seen in other f-orbital materials. Up to this point it has been difficult to measure the low energy electrodynamic response of these materials. However, high quality films of YbAl3 have been successfully grown and demonstrate significant changes in the electronic structure of the material mediated by the valence change in Yb. We have investigated the THz range electrodynamic response of these materials and discuss the results from the optical conductivity in the context of prevailing theories.

–

Presenters

  • David Barbalas

    Johns Hopkins University

Authors

  • David Barbalas

    Johns Hopkins University

  • Shouvik Chatterjee

    Electrical & Computer Engineering, University of California, Santa Barbara, UCSB, Materials Department, University of California, Santa Barbara

  • Kyle M Shen

    Cornell University, Department of Physics, Laboratory of Atomic and Solid State Physics, Kavli Institute at Cornell for Nanoscale Science, Cornell University

  • Darrell G. Schlom

    Cornell University, Cornell University, Ithaca, New York 14853, USA, Department of Materials Science and Engineering, Cornell University, Department of Materials Science and Engineering, Kavli Institute at Cornell for Nanoscale Science, Cornell University, Materials Science & Engineering, Cornell University, Department of Materials Science and Engineering,, Cornell University, Materials Science and Engineering, University of Cornell

  • Norman Armitage

    Johns Hopkins University, Department of Physics, Institute for Quantum Matter, Johns Hopkins University