Regensburg 2010 – scientific programme
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TT: Fachverband Tiefe Temperaturen
TT 27: CE: Poster Session
TT 27.17: Poster
Wednesday, March 24, 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)