First neutron studies of the magnetism and rattling modes in CePt4Ge12

International Conference on Strongly Correlated Electron Systems 2014

Galéra, R.M.^1 ; Opagiste, C.^1 ; Amara, M.^1 ; Zbiri, M.^2 ; Rols, S.^2

Institut NÉEL, CNRS, University Grenoble Alpes, BP 166, Grenoble

38042, France^1

Institut Laue-Langevin, CS 20156, Grenoble

F-38042, France^2

关键词: Ce compounds;    Crystal field excitations;    Filled-skutterudite;    Inelastic neutrons;    Intermediate valence;    Kondo-lattice behavior;    Rattling vibration;    Structural and magnetic properties;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/592/1/012011/pdf
DOI  :  10.1088/1742-6596/592/1/012011

来源: IOP

【 摘 要 】

The filled skutterudite CePt4Ge12is reported to be at the border between an intermediate valence (IV) state and a Kondo lattice behavior. We report here the first inelastic neutron scattering experiments, carried out on the Ce compound and its non-magnetic counterpart LaPt4Ge12. Prior the neutron studies, the structural and magnetic properties of both samples have been determined. Inelastic neutron scattering spectra are dominated by phonon contribution for both compounds. A rattling vibration mode is observed at 6.9 meV and 7.5 meV for the Ce and La compounds, respectively. In CePt4Ge12no crystal field excitation could be resolved. Only a small and wide extra contribution at high energy (22-28 meV) is observed. This result would be more consistent with an IV behavior.