TY - JOUR
T1 - Q-dependence of the spin fluctuations in the intermediate valence compound CePd3
AU - Fanelli, V. R.
AU - Lawrence, J. M.
AU - Goremychkin, E. A.
AU - Osborn, R.
AU - Bauer, E. D.
AU - McClellan, K. J.
AU - Thompson, J. D.
AU - Booth, C. H.
AU - Christianson, A. D.
AU - Riseborough, P. S.
PY - 2014/6/4
Y1 - 2014/6/4
N2 - 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.
AB - 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.
KW - Anderson impurity model
KW - Anderson lattice model
KW - Kondo model
KW - inelastic neutron scattering
KW - intermediate valence
UR - http://www.scopus.com/inward/record.url?scp=84900819243&partnerID=8YFLogxK
U2 - 10.1088/0953-8984/26/22/225602
DO - 10.1088/0953-8984/26/22/225602
M3 - Article
C2 - 24824417
AN - SCOPUS:84900819243
SN - 0953-8984
VL - 26
JO - Journal of Physics Condensed Matter
JF - Journal of Physics Condensed Matter
IS - 22
M1 - 225602
ER -