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

Journal Article · Wed Jun 25 00:00:00 EDT 2014 · JOURNAL OF PHYSICS-CONDENSED MATTER

DOI:https://doi.org/10.1088/0953-8984/26/22/225602· OSTI ID:1163868

Fanelli, V. R.; Lawrence, J. M.; Goremychkin, E. A.; Osborn, R.; Bauer, E. D.; McClellan, K. J.; Thompson, J. D.; Booth, C. H.; Christianson, A. D.; Riseborough, P. S.

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.

• Research Organization: Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
• Sponsoring Organization: Chemical Sciences Division
• DOE Contract Number: DE-AC02-05CH11231
• OSTI ID: 1163868
• Report Number(s): LBNL-6689E
• Journal Information: JOURNAL OF PHYSICS-CONDENSED MATTER, Vol. 26, Issue 22; Related Information: Journal Publication Date: 2014; ISSN 0953--8984
• Country of Publication: United States
• Language: English

Related Subjects

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