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Science. 2018 Jan 12;359(6372):186-191. doi: 10.1126/science.aan0593.

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

Author information

1
Frank Laboratory of Neutron Physics, Joint Institute for Nuclear Research, Dubna, Moscow Region, 141980, Russia.
2
Materials Science Division, Argonne National Laboratory, Argonne, IL 60439-4845, USA.
3
Department of Physics, University of Illinois at Chicago, Chicago, IL 60607, USA.
4
Materials Science Division, Argonne National Laboratory, Argonne, IL 60439-4845, USA. rosborn@anl.gov.
5
Institute for Solid State Physics, Karlsruhe Institute of Technology, D-76021 Karlsruhe, Germany.
6
Instrument and Source Division, Oak Ridge National Laboratory, Oak Ridge, TN 37831, USA.
7
Quantum Condensed Matter Division, Oak Ridge National Laboratory, Oak Ridge, TN 37831, USA.
8
Los Alamos National Laboratory, Los Alamos, NM 87545, USA.
9
Department of Physics and Astronomy, University of California, Irvine, CA 92697, USA.

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 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.

PMID:
29326267
DOI:
10.1126/science.aan0593

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