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Inelastic neutron scattering experiments have been used to examine the low-frequency (less than 2 meV) response of polycrystalline samples of the heavy fermion UBe(13). A quasielastic response with a characteristic linewidth of 1.5 meV for T greater than 1 K is found. Surprisingly no anomalous dependence of this response on q, the reduced reciprocal lattice vector, was found. The strength of the response corresponds to roughly 60% of the bulk susceptibility, and it scales with the latter for T in the range 1.5 to 30 K. Taking into account earlier experiments, the total response function for UBe(13) thus contains two components, one with a linewidth of 1.5 meV and the other with a linewidth of roughly 13 meV. The weight is approximately evenly divided between the two. UBe(13) is therefore similar to UPt(3) in that the magnetic response functions exist on two quite different energy scales. This appears to be different from Ce-based heavy fermions, and is not yet understood.

Additional information

Authors: LANDER G H, JRC Karlsruhe (DE);SHAPIRO S M, Brookhaven National Laboratory, Physics Department, New York (US);VETTIER C, European Synchrotron Radiation Facility, Grenoble (FR);DIANOUX A J, Institut Laue Langevin, Grenoble (FR)
Bibliographic Reference: Article: Physical Review B, Vol. 46 (1992) No. 9, pp. 5387-5391
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