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    Q-dependence of the spin fluctuations in the intermediate valence compound CePd<inf>3</inf>

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    Genre
    Journal Article
    Date
    2014-06-04
    Author
    Fanelli, VR
    Lawrence, JM
    Goremychkin, EA
    Osborn, R
    Bauer, ED
    McClellan, KJ
    Thompson, JD
    Booth, CH
    Christianson, AD
    Riseborough, PS
    Subject
    Anderson impurity model
    Anderson lattice model
    intermediate valence
    Kondo model
    inelastic neutron scattering
    Permanent link to this record
    http://hdl.handle.net/20.500.12613/5878
    
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    DOI
    10.1088/0953-8984/26/22/225602
    Abstract
    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. © 2014 IOP Publishing Ltd.
    Citation to related work
    IOP Publishing
    Has part
    Journal of Physics Condensed Matter
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    ae974a485f413a2113503eed53cd6c53
    http://dx.doi.org/10.34944/dspace/5860
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