Volume 69, Number 4, February 2005
|Page(s)||577 - 582|
|Section||Condensed matter: electronic structure, electrical, magnetic, and optical properties|
|Published online||26 January 2005|
Disorder tuning of non-Fermi-liquid behaviour in
DRFMC, CEA-Grenoble - F-38054 Grenoble, France
2 Institut Laue Langevin - F-38042 Grenoble, France
3 Institut für Physik, Universität Augsburg - D-86159 Augsburg, Germany
4 ISIS Facility, RAL - Didcot, Oxfordshire, UK
5 Institut für Physik, TU Braunschweig - D-38106 Braunschweig, Germany
Accepted: 7 December 2004
Neutron inelastic scattering has been used to examine the space-time magnetic correlation function in the non-Fermi-liquid compound . In contrast with the results obtained previously on as-cast samples, the response of carefully annealed material shows a simple exponential time dependence. These microscopic measurements confirm an earlier conjecture based on annealing experiments that, whilst atomic disorder is not the origin of non-Fermi-liquid behaviour in , the order-disorder equilibrium may, however, in a similar manner to the use of applied magnetic field, pressure and composition, be used as a tuning parameter to achieve non-Fermi-liquid response.
PACS: 71.10.Hf – Non-Fermi-liquid ground states, electron phase diagrams and phase transitions in model systems / 71.27.+a – Strongly correlated electron systems; heavy fermions / 75.20.Hr – Local moment in compounds and alloys; Kondo effect, valence fluctuations, heavy fermions
© EDP Sciences, 2005
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