corner
corner
APS » Journals » Phys. Rev. Lett. » Volume 87 » Issue 6
< Previous Article | Next Article >

Phys. Rev. Lett. 87, 066402 (2001) [4 pages]

Glassy Spin Dynamics in Non-Fermi-Liquid UCu5-xPdx, x =  1.0 and 1.5

Download: PDF (133 kB) Buy this article Export: BibTeX or EndNote (RIS)

D. E. MacLaughlin1, O. O. Bernal2, R. H. Heffner3, G. J. Nieuwenhuys4, M. S. Rose1, J. E. Sonier3,*, B. Andraka5, R. Chau6,†, and M. B. Maple6
1Department of Physics, University of California, Riverside, California 92521-0413
2Department of Physics, California State University, Los Angeles, California 90032
3MS K764, Los Alamos National Laboratory, Los Alamos, New Mexico 87545
4Kamerlingh Onnes Laboratory, Leiden University, 2300 RA Leiden, The Netherlands
5Department of Physics, University of Florida, Gainesville, Florida 32611
6Department of Physics, University of California, San Diego, La Jolla, California 92093

Received 20 December 2000; published 19 July 2001

Local f-electron spin dynamics in the non-Fermi-liquid heavy-fermion alloys UCu5-xPdx, x = 1.0 and 1.5, have been studied using muon spin-lattice relaxation. The sample-averaged asymmetry function G̅ (t) indicates strongly inhomogeneous spin fluctuations and exhibits the scaling G̅ (t,H) = G̅ (t/Hγ) expected from glassy dynamics. At 0.05 K γ(x = 1.0) = 0.35±0.1, but γ(x = 1.5) = 0.7±0.1. This is in contrast to inelastic neutron scattering results, which yield γ = 0.33 for both concentrations. There is no sign of static magnetism≳10-3μB/U ion in either material above 0.05 K. Our results strongly suggest that both alloys are quantum spin glasses.

© 2001 The American Physical Society

URL:
http://link.aps.org/doi/10.1103/PhysRevLett.87.066402
DOI:
10.1103/PhysRevLett.87.066402
PACS:
71.27.+a, 75.30.Mb, 76.60.Cq

*Present address: Simon Fraser University, Burnaby, Canada V5A 1S6.

†Present address: Lawrence Livermore National Laboratory, Livermore, CA 94550.

 
< Previous Article | Next Article >