Abstract
The interplay between the crystallographic structure, valence state, and lattice dynamics of the series 0.5, and 1) has been investigated using x-ray diffraction, the Mössbauer effect, and the nuclear inelastic scattering of synchrotron radiation, respectively. We show that the first-order, isostructural phase transition which occurs at is not connected with a change of the valence state but is associated with a significant modification of the Eu partial phonon density of states (PDOS). Lattice dynamical calculations on show that the observed change in the PDOS can be attributed to the structural change at the phase transition.
- Received 30 October 2003
DOI:https://doi.org/10.1103/PhysRevB.69.100102
©2004 American Physical Society