Neutron spectroscopic measurements of the magnetic excitations in PrO2 reveal (1) sharp peaks characteristic of transitions between levels of the 4f1 configuration of Pr4+ split by the cubic crystal field, and (2) broad bands of scattering centered near 30 and 160 meV. We present a simple model based on a vibronic Hamiltonian that accounts for these contrasting features of the data. The analysis shows that 90%±10% of the Pr ions have a localized 4f1 configuration and provides strong evidence for a dynamic Jahn-Teller effect in the Γ8 electronic ground state.

Localized 4f States and Dynamic Jahn-Teller Effect in PrO2 / A. T., Boothroyd; C. H., Gardiner; S. J. S., Lister; Santini, Paolo; B. D., Rainford; L. D., Noailles; D. B., Currie; R. S., Eccleston; R. I., Bewley. - In: PHYSICAL REVIEW LETTERS. - ISSN 0031-9007. - 86:(2001), pp. 2082-2085. [10.1103/PhysRevLett.86.2082]

Localized 4f States and Dynamic Jahn-Teller Effect in PrO2

SANTINI, Paolo;
2001-01-01

Abstract

Neutron spectroscopic measurements of the magnetic excitations in PrO2 reveal (1) sharp peaks characteristic of transitions between levels of the 4f1 configuration of Pr4+ split by the cubic crystal field, and (2) broad bands of scattering centered near 30 and 160 meV. We present a simple model based on a vibronic Hamiltonian that accounts for these contrasting features of the data. The analysis shows that 90%±10% of the Pr ions have a localized 4f1 configuration and provides strong evidence for a dynamic Jahn-Teller effect in the Γ8 electronic ground state.
2001
Localized 4f States and Dynamic Jahn-Teller Effect in PrO2 / A. T., Boothroyd; C. H., Gardiner; S. J. S., Lister; Santini, Paolo; B. D., Rainford; L. D., Noailles; D. B., Currie; R. S., Eccleston; R. I., Bewley. - In: PHYSICAL REVIEW LETTERS. - ISSN 0031-9007. - 86:(2001), pp. 2082-2085. [10.1103/PhysRevLett.86.2082]
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11381/2432489
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