Dresden 2006 – wissenschaftliches Programm
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TT: Tiefe Temperaturen
TT 8: Correlated Electrons: Heavy Fermions
TT 8.7: Vortrag
Montag, 27. März 2006, 16:15–16:30, HSZ 301
CeCu6−xAux NMR studies Part I - crystal field analysis and the assignment of Cu sites — •Bernd Pilawa, Max Winkelmann, Gerda Fischer, and Elmar Dormann — Physikalisches Institut, Universität Karlsruhe, D-76128 Karlsruhe, Germany
In CeCu6−xAux the Ce3+ 4f1 2F5/2 groundstate is split into three doublets. The crystal field splitting is known from neutron scattering forx=0.5 and 0. A calculation of the magnetic susceptibility using one antiferromagnetic molecular field constant λ as approximation for the Kondo like shielding and the influence of orbit and spin scattering on the interaction of the Ce moments describes the experimental data quite well.
We managed to calculate the electric field gradients at the 5 inequivalent Cu sites of CeCu6 with the WIEN2k-Software-Package. Spectra generated with these parameters fit to NMR-spectra measured for oriented single crystal powder samples at various temperatures between 5k and 100k at a magnetic field of 7T. Therefore the information in various NMR- and NQR-studies can now be compared to the crystallographic information.