Heavy fermion fluid in high magnetic fields: an infrared study of CeRu$_4$Sb$_{12}$

ORAL

Abstract

We will report the first comprehensive infrared spectroscopy study of a heavy fermion state in high magnetic field. Detailed analysis of optical constants will be presented for CeRu$_4$Sb$_{12}$ in fields up to 17\,T. We find that the applied magnetic field strongly affects the low energy excitations by destroying coherence in the system. In particular, the quasiparticle effective mass m$^*$ is suppressed by as much as 25\,$\%$. This effect is in quantitative agreement with the mean-field solution of the periodic Anderson model augmented with a Zeeman term.

–

Authors

  • Sasa Dordevic

    • Department of Physics, University of California, San Diego, La Jolla, CA 92093

  • Kevin Beach

    • Department of Physics, Boston University, Boston, MA 02215

  • Naoya Takeda

    • Institute for Solid State Physics, University of Tokyo, 5-1-5 Kashiwa, Chiba 277-8581, Japan

  • Yong-Jie Wang

    • National High Magnetic Field Laboratory, Tallahassee, FL 32310

  • M. Brian Maple

  • Dimitri Basov

    • Department of Physics, University of California, San Diego, La Jolla, CA 92093