Coherent band excitations in CePd<sub>3</sub>: A comparison of neutron scattering and ab initio theory.
basic_science · Level V
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- Record sourced from PubMed, PMID 29326267.
- Also identified by DOI 10.1126/science.aan0593.
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Abstract
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 CePd<sub>3</sub> 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.