A THz spectroscopy investigation of the heavy fermion state in CeCu$_2$Ge$_2$

ORAL

Abstract

We present time-domain THz spectroscopy data of a thin film of the heavy fermion compound CeCu$_2$Ge$_2$. Measurements to obtain the frequency dependent complex conductivity were taken as a function of temperature down to temperatures well below the onset of magnetic order. At low temperatures a narrow Drude-like peak forms, which is likely associated with the heavy fermion or spin density wave state. Using this data in conjunction with DC resistivity measurements, we obtain the frequency dependence of the scattering rate and the mass renormalization through an extended Drude model analysis.

*This has been supported at JHU by the Gordon and Betty Moore Foundation. At UIUC, this work has been supported by the Center for Emergent Superconductivity, funded by the DOE award DE-AC0298CH1088.

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Authors

  • Grace Bosse

    • JHU Dept. of Physics and Astronomy

  • L. Bilbro

    • JHU Dept. of Physics and Astronomy

  • R. Valdes Augilar

    • JHU Dept. of Physics and Astronomy

  • Y. Li

    • Dept. of Physics, University of Illinois

  • J. Eckstein

    • Dept. of Physics, University of Illinois

  • N.P. Armitage

    • JHU Dept. of Physics and Astronomy