3 years ago

Coherent band excitations in CePd3: A comparison of neutron scattering and ab initio theory

Darrin D. Byler, Matthew B. Stone, Victor R. Fanelli, Eugene A. Goremychkin, Kenneth J. McClellan, Hyowon Park, Raymond Osborn, Jon M. Lawrence, Stephan Rosenkranz, Eric D. Bauer, Andrew D. Christianson, John-Paul Castellan

In common with many strongly correlated electron systems, intermediate valence compounds are believed to display a crossover from a high-temperature regime of incoherently fluctuating local moments to a low-temperature regime of coherent hybridized bands. We show that inelastic neutron scattering measurements of the dynamic magnetic susceptibility of CePd3 provides a benchmark for ab initio calculations based on dynamical mean field theory. The magnetic response is strongly momentum dependent thanks to the formation of coherent f-electron bands at low temperature, with an amplitude that is strongly enhanced by local particle-hole interactions. The agreement between experiment and theory shows that we have a robust first-principles understanding of the temperature dependence of f-electron coherence.

Publisher URL: http://science.sciencemag.org/cgi/content/short/359/6372/186

DOI: 10.1126/science.aan0593

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