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Competing polarization mechanisms in the heavy-fermion paramagnet CeCu 6

Site specific NMR information for CeCu6 powder samples
  • M. Winkelmann
  • G. Fischer
  • B. Pilawa
  • E. Dormann
  • 99 Downloads

Abstract:

Nuclear magnetic resonance (NMR) and relaxation of 63Cu and 65Cu in a powder sample of the heavy-fermion paramagnet CeCu6 is measured and analysed quantitatively. Five different Cu sites are accessible to a detailed analysis. We derive quadrupolar splitting frequencies, Ce to Cu transferred hyperfine field coupling constants, and transversal as well as longitudinal relaxation behaviour. Only small relaxation anomalies are observed at the orthorhombic to monoclinic structural phase transition of CeCu6. We point to the different importance of transferred hyperfine interaction and local conduction electron density for static or dynamic part, respectively, of Cu hyperfine interaction. The different sign of the transferred hyperfine interaction from Ce3+ to different Cu neighbours reveals the different competing interaction mechanisms, giving rise to the heavy-fermion paramagnetic behavior of CeCu6.

PACS. 76.60.-k Nuclear magnetic resonance and relaxation – 75.20.Hr Local moment in compounds and alloys; Kondo effect, valence fluctuations, heavy fermions 

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Copyright information

© EDP Sciences, Springer-Verlag 2002

Authors and Affiliations

  • M. Winkelmann
    • 1
  • G. Fischer
    • 1
  • B. Pilawa
    • 1
  • E. Dormann
    • 1
  1. 1.Physikalisches Institut, Universität Karlsruhe, Wolfgang-Gaede-Str. 1, 76128 Karlsruhe, GermanyDE

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