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Title: Q-dependence of the spin fluctuations in the intermediate valence compound CePd3

We report inelastic neutron scattering experiments on a single crystal of the intermediate valence compound CePd3. At 300 K the magnetic scattering is quasielastic, with half-width G = 23 meV, and is independent of momentum transfer Q. At low temperature, the Q-averaged magnetic spectrum is inelastic, exhibiting a broad peak centered near E-max = 55 meV. These results, together with the temperature dependence of the susceptibility, 4f occupation number, and specific heat, can be fit by the Kondo/Anderson impurity model. The low temperature scattering near Emax, however, shows significant variations with Q, reflecting the coherence of the 4f lattice. The intensity is maximal at (1/2, 1/2, 0), intermediate at (1/2, 0, 0) and (0, 0, 0), and weak at (1/2, 1/2, 1/2). We discuss this Q-dependence in terms of current ideas about coherence in heavy fermion systems.
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Publication Date:
OSTI Identifier:
Report Number(s):
Journal ID: ISSN 0953--8984
DOE Contract Number:
Resource Type:
Journal Article
Resource Relation:
Journal Name: JOURNAL OF PHYSICS-CONDENSED MATTER; Journal Volume: 26; Journal Issue: 22; Related Information: Journal Publication Date: 2014
Research Org:
Ernest Orlando Lawrence Berkeley National Laboratory, Berkeley, CA (US)
Sponsoring Org:
Chemical Sciences Division
Country of Publication:
United States
75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY Anderson impurity model; Anderson lattice model; intermediate valence; Kondo model; inelastic neutron scattering; NEUTRON INELASTIC-SCATTERING; SINGLE-CRYSTAL; SPECTRAL RESPONSE; KONDO-LATTICE