Fermi Volume Evolution and Crystal-Field Excitations in Heavy-Fermion Compounds Probed by Time-Domain Terahertz Spectroscopy
| Autor: | Hilbert von Löhneysen, Manfred Fiebig, Johann Kroha, Oliver Stockert, Christoph Wetli, Shovon Pal, Farzaneh Zamani |
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| Rok vydání: | 2019 |
| Předmět: |
Physics
Strongly Correlated Electrons (cond-mat.str-el) Field (physics) Condensed matter physics Terahertz radiation FOS: Physical sciences General Physics and Astronomy 01 natural sciences Measure (mathematics) 3. Good health Terahertz spectroscopy and technology Crystal Condensed Matter - Strongly Correlated Electrons 0103 physical sciences Quasiparticle Condensed Matter::Strongly Correlated Electrons 010306 general physics Lattice model (physics) Fermi Gamma-ray Space Telescope |
| Zdroj: | Physical Review Letters, 122 (9) |
| ISSN: | 1079-7114 0031-9007 |
| Popis: | We measure the quasiparticle weight in the heavy-fermion compound CeCu$_{6-x}$Au$_{x}$ ($x=0,\ 0.1$) by time-resolved THz spectroscopy for temperatures from 2 up to 300\,K. This method distinguishes contributions from the heavy Kondo band and from the crystal-electric-field satellite bands by different THz response delay times. We find that the formation of heavy bands is controlled by an exponentially enhanced, high-energy Kondo scale once the crystal-electric-field states become thermally occupied. We corroborate these observations by temperature-dependent dynamical mean-field calculations for the multi-orbital Anderson lattice model and discuss consequences for quantum critical scenarios. Comment: Published version, 6 pages (including references), 5 figures, Supplemental Material (2 pages) added |
| Databáze: | OpenAIRE |
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