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

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.

Source: ScienceNOW - January 11, 2018 Category: Science Authors: Goremychkin, E. A., Park, H., Osborn, R., Rosenkranz, S., Castellan, J.-P., Fanelli, V. R., Christianson, A. D., Stone, M. B., Bauer, E. D., McClellan, K. J., Byler, D. D., Lawrence, J. M. Tags: Physics r-articles Source Type: news