Summary: VOLUME 87, NUMBER 19 P H Y S I C A L R E V I E W L E T T E R S 5 NOVEMBER 2001
Magnetic Correlations and the Quantum Critical Point of UCu52xPdx x 5 1, 1.5
M.C. Aronson,1 R. Osborn,2 R. Chau,3,* M.B. Maple,3 B. D. Rainford,4 and A. P. Murani5
1
Department of Physics, University of Michigan, Ann Arbor, Michigan 48109-1120
2
Materials Science Division, Argonne National Laboratory, Argonne, Illinois 60439-4845
3
University of California­San Diego, La Jolla, California 92093
4
Department of Physics, Southampton University, Southampton SO17 1BJ, United Kingdom
5
Institut Laue Langevin, Grenoble, France
(Received 7 May 2001; published 23 October 2001)
We have used inelastic neutron scattering to determine the magnetic susceptibility x q, v, T of the
non-Fermi-liquid compounds UCu52xPdx x 1, 1.5 for energies v between 0.2 and 2 meV, and for
temperatures T between 1.6 and 250 K. Spatial correlations in both UCu4Pd and UCu3.5Pd1.5 extend
over length scales comparable to the unit cell, and display very little temperature dependence. In contrast,
the wave vector independent susceptibility diverges as T ! 0. We find that the excitations at all q, and
for all T and v accessed display the same type of non-Fermi-liquid v T scaling.

Source: Aronson, Meigan - Department of Physics and Astronomy, SUNY at Stony Brook

Collections: Materials Science; Physics