Coupling between crystal field transitions and phonons in the 4f-electron system CeCu2
| Autor: | U. Witte, M. Loewenhaupt, R. Schedler, J. Kulda |
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| Rok vydání: | 2003 |
| Předmět: |
Physics
Condensed matter physics Phonon Inelastic scattering Condensed Matter Physics Inelastic neutron scattering Electronic Optical and Magnetic Materials Condensed Matter::Superconductivity Excited state Dispersion relation Condensed Matter::Strongly Correlated Electrons Neutron Electrical and Electronic Engineering Atomic physics Ground state Single crystal |
| Zdroj: | Physica B: Condensed Matter. 335:41-43 |
| ISSN: | 0921-4526 |
| DOI: | 10.1016/s0921-4526(03)00187-x |
| Popis: | In general, elementary excitations like phonons and crystal field (CF) transitions are considered decoupled and the determination and interpretation of the measured spectra of both phenomena, i.e. the phonon dispersion relations and the CF level schemes are made independently of each other. A signature of a strong coupling between both phenomena is the observation of an unusual behaviour in both subsystems. In this paper, we present inelastic neutron scattering results on the rare earth compound CeCu2. This substance shows a orthorhombic CeCu2 structure with 18 phonon modes and a splitting of the J= 5 2 ground state multiplet of the Ce3+ ions into 3 doublets. The assumption of a coupling between a CF transition connecting the two excited CF states and phonons was put forward from the results of inelastic neutron data on a polycrystalline sample. This assumption is now confirmed by inelastic neutron spectra on a single crystal showing unusual phonon energy shifts and line widths as well as a strong broadening of the CF excitations. |
| Databáze: | OpenAIRE |
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