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Single crystals of the heavy-fermion superconductor Ube(13) doped with 3.5% Th have been studied by neutron scattering techniques. This material undergoes two superconducting transitions at T(c1) approximately = 0.55 and T(c2) approximately = 0.40 K. Using elastic neutron scattering we found no evidence for either short- or long-range magnetic order down to temperatures of 0.15 K. Similarly, exhaustive scans at reasonably high values of the momentum transfer found no evidence of a recently predicted internal lattice rearrangement of the Be nuclei at low temperatures. However, using neutron inelastic scattering we did find weak signals with a propagation direction q = [0.5 0.5] 0 indicating antiferromagnetic fluctuations that are short range in real space, and are also short lived. These correlations disappear only above about 30 K, similar to effects found in pure Ube(13). They also show no variation on passing through T(c).

Additional information

Authors: HIESS A, Institut Laue-Langevin, Grenoble (FR);HEFFNER R H ET AL, Materials Science and Technology Division;SONIER J E, Los Alamos National Laboratory, Los Alamos (US);LANDER G H, Department of Physics, Simon Fraser University, Burnaby (CA)
Bibliographic Reference: An article published in: Physical Review B, 66, 064531 (2002)
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Record Number: 200215705 / Last updated on: 2003-01-09
Original language: en
Available languages: en