Disorder tuning of non-Fermi-liquid behaviour in

P. Giudicelli; U. Killer; J. W. Taylor; S. J. Levett; A. Otop; E.-W. Scheidt; A. Stunault; N. Bernhoeft

doi:10.1209/epl/i2004-10377-0

All issues

Volume 69 / No 4 (February 2005)

Europhys. Lett., 69 4 (2005) 577-582

Abstract

Issue		Europhys. Lett. Volume 69, Number 4, February 2005


Page(s)		577 - 582
Section		Condensed matter: electronic structure, electrical, magnetic, and optical properties
DOI		https://doi.org/10.1209/epl/i2004-10377-0
Published online		26 January 2005

Europhys. Lett., 69 (4), pp. 577-582 (2005)

Disorder tuning of non-Fermi-liquid behaviour in $\chem{UCu_4Pd}$

P. Giudicelli¹^,2, U. Killer³, J. W. Taylor⁴, S. J. Levett⁴, A. Otop⁵, E.-W. Scheidt³, A. Stunault² and N. Bernhoeft¹

¹ 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

Received: 22 September 2004
Accepted: 7 December 2004

Abstract

Neutron inelastic scattering has been used to examine the space-time magnetic correlation function in the non-Fermi-liquid compound $\chem{UCu_4Pd}$ . 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 $\chem{UCu_4Pd}$ , 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

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