Regensburg 2002 – wissenschaftliches Programm
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TT: Tiefe Temperaturen
TT 17: Postersitzung II: Mesoskopische Systeme (1-19), Supraleiter: Theorie (20-26), Elektronenstruktur, Phononen, Tunneln, Ordnungsparameter (27-33), Schwere Fermionen, Kondo-Systeme (34-45)
TT 17.35: Poster
Mittwoch, 13. März 2002, 14:30–18:00, A
Heavy Fermion State of YbB12 Studied by Optical Spectroscopy — •B. Gorshunov1, O. Ushakov1, T. Rõõm1, M. Dressel1, and F. Iga2 — 11. Physikalisches Institut, Universität Stuttgart — 2ADSM, Hiroshima University, Higashi-Hiroshima, Japan
Optical reflectivity measurements have been performed on a heavy-fermion Kondo insulator YbB12 in the range of frequencies 5 − 104 cm−1 at temperatures 5−300 K. The spectra of the Kramers-Kronig derived optical conductivity and dielectric constant show a hybridization gap at the energy of about 20−30 meV developing below approximately 100 K and a narrow Drude-like resonance produced by heavy charge carriers. On the basis of the obtained optical data, the characteristics of the heavy-fermion ground state in YbB12 are analyzed.