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TT: Tiefe Temperaturen
TT 24: Postersitzung III: Korrelierte Elektronen, ”Orbital Physics”
TT 24.34: Poster
Wednesday, March 10, 2004, 14:30–19:00, Poster A
Transferred hyperfine fields in the heavy fermion compounds CeCu6−xAux — •Max Winkelmann, Gerda Fischer, and Elmar Dormann — Physikalisches Institut, Universitaet Karlsruhe, D-76128 Karlsruhe
CeCu6 is one of the best known heavy-fermion paramagnets, CeCu5Au1 is a heavy-fermion antiferromagnet with TN = 2.3 K, and for x ≈ 0.1 signatures of non-Fermi-liquid behaviour were reported. We present temperature dependent studies of 63Cu- and 65Cu-NMR line shifts for CeCu6−xAux (x=0;0.1;1) single-crystal powder samples. These are different to the earlier[1] presented line shifts for polycrystalline powder samples. Via the correlation with the temperature dependence of the static magnetic susceptibility, Cu-site dependent Knight shift and transferred hyperfine field coupling constants are derived. Local polarization varies in sign and is larger by a factor of 10 than indicated by the earlier published[2] high-temperature average value.
[1] M. Winkelmann, et al. Eur. Phys. J. B 26, (2002) 199
[2] I. Pop, et al. Czech. J. Phys. B 24 (1974) 1398