Crystal-field excitation spectra of Pr4f electron state in the filled skutterudite PrOs4 P12 measured by inelastic neutron scattering experiment evolve distinctly with temperature variation. The spectral widths of excitations from the ground-state singlet to the two triplets and their temperature dependences are well reproduced by the theory based on the exchange coupling between 4f and conduction electrons. The shift of level energies by around 1 meV below 60 K indicates modification of crystal-field potential with variation of thermal population of 4f electron crystal-field states. The spectral evolution is consistent with the specific heat data that deviates from the calculated one for the well-localized 4f electron. The result supports the effect of p-f hybridization between Pr4f and Pp states in PrOs4 P12.
|Journal||Physical Review B - Condensed Matter and Materials Physics|
|Publication status||Published - 2009 Jun 8|
ASJC Scopus subject areas
- Electronic, Optical and Magnetic Materials
- Condensed Matter Physics