Regensburg 2004 – wissenschaftliches Programm

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TT: Tiefe Temperaturen

TT 24: Postersitzung III: Korrelierte Elektronen, ”Orbital Physics”

TT 24.35: Poster

Mittwoch, 10. März 2004, 14:30–19:00, Poster A

Heavy Fermion CePd₃: Coherent State Versus Kondo Holes — •Philipp Haas, Peter Weber, Konstantin Petukhov, Oleg Ushakov, Boris Gorshunov, and Martin Dressel — 1. Physikalisches Institut, Universität Stuttgart, 70550 Stuttgart

The formation of the coherent heavy-fermion state in CePd₃ is studied when doped with non-magnetic La. The La atoms act as Kondo-holes. Low-energy excitations are studied by dc, microwave, THz, and infrared measurements at temperatures from 5 K to 300 K. Pure CePd₃ shows typical features for heavy-fermion systems in the conductivity spectra: A hybridization gap opens at around 1000 cm⁻¹; below 50 cm⁻¹ the optical conductivity increases. In addition, at microwave frequency a feature is detected which resembles an extremely small energy gap (≈ 2 cm⁻¹).