Dresden 2006 – wissenschaftliches Programm

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TT: Tiefe Temperaturen

TT 8: Correlated Electrons: Heavy Fermions

TT 8.8: Vortrag

Montag, 27. März 2006, 16:30–16:45, HSZ 301

CeCu_6−xAu_x NMR studies Part II - Analysis of NMR line shift — •Max Winkelmann¹, Bernd Pilawa¹, M.S.S. Brooks², and Elmar Dormann¹ — ¹Physikalisches Institut, Universität Karlsruhe, D-76128 Karlsruhe, Germany — ²Commission of the European Communities, Joint Research Center, Institut of Transuranium Elements, D-76021 Karlsruhe, Germany

We have carried out various NMR-measurements on the well-known heavy-fermion system CeCu_6−xAu_x. As a result we present Cu-site specific bare Knight shift data and transferred hyperfine interaction coupling constants α in thetemperature range from 100K down to 5K, derived from NMR-spectra in a magnetic field of 7T. The interaction coupling constants are showing alternating signs which can be understood by the variing contribution of s,p and d electrons which are calculated by ab initio self-consistent band structure calculations.

While substituting the Cu(2)-site with Au the transferred hyperfine interactioncoupling constants decrease, whereas the absolut line-shift is increasing. Thiscould be explained by a larger susceptibility of CeCu₅Au₁. For one of the Cu sites evidence for the anisotropy of the transferred field coupling constant is obtained.