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Q-dependence of the spin fluctuations in the intermediate valence compound CePd<inf>3</inf>
Fanelli, VR Lawrence, JM Goremychkin, EA Osborn, R Bauer, ED McClellan, KJ Thompson, JD Booth, CH Christianson, AD Riseborough, PS
Fanelli, VR
Lawrence, JM
Goremychkin, EA
Osborn, R
Bauer, ED
McClellan, KJ
Thompson, JD
Booth, CH
Christianson, AD
Riseborough, PS
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Journal Article
Date
2014-06-04
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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.
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Journal of Physics Condensed Matter
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