Regensburg 2004 – wissenschaftliches Programm

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TT: Tiefe Temperaturen

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

TT 24.34: Poster

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

Transferred hyperfine fields in the heavy fermion compounds CeCu_6−xAu_x — •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 T_N = 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 CeCu_6−xAu_x (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