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TT: Fachverband Tiefe Temperaturen

TT 27: CE: Poster Session

TT 27.17: Poster

Mittwoch, 24. März 2010, 14:00–18:00, Poster D1

Far-infrared optical conductivity of CeCu₂Si₂ — •Alexander Herzog¹, Jörg Sichelschmidt¹, Shin-ichi Kimura², Christoph Geibel¹, Hirale Jeevan¹, and Frank Steglich¹ — ¹MPI Chem. Physik fester Stoffe, 01187 Dresden — ²UVSOR, Institute for Molecular Science, Okazaki 444-8585, Japan

We investigated the optical reflectivity of a S/A-type single crystal of the heavy-fermion metal CeCu₂Si₂ in the energy range 3 meV – 30 eV for temperatures between 8K – 300K. Our preliminary results for the charge dynamics indicate a behavior that is expected for a formation of a coherent heavy quasiparticle state [1]: Upon cooling we observe a narrowing of the Drude-like part of the optical conductivity corresponding to an enhancement of the quasiparticle effective mass and scattering time. Furthermore, towards cooling down to T=8 K a redistribution of spectral weight occurs essentially from the energy region below 0.6 eV towards energies below 3 meV.

[1] L. Degiorgi, Rev. Mod. Phys. 71, 687 (1999)