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J Phys Condens Matter. 2014 Jun 4;26(22):225602. doi: 10.1088/0953-8984/26/22/225602. Epub 2014 May 14.

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

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Los Alamos National Laboratory, Los Alamos, NM 87545, USA. Department of Physics and Astronomy, University of California, Irvine, CA 92697, USA.


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 Γ = 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 Emax = 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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