We report results of NMR measurements on the 39, 41K and 17O nuclei in KOs2 O6. We found that the relaxation rate divided by temperature 1 / (T1 T) at the K sites is strongly enhanced compared with the values expected from the Knight shift and the Korringa relation. By comparing the results at the 39K and 41K sites, we conclude that the relaxation at the K sites is caused entirely by phonons via the electric quadrupole interaction. Consequently, our results provide information about the dynamics of isolated anharmonic vibration associated with the rattling of K ions.
- KOs O
- β-Pyrochlore oxide
ASJC Scopus subject areas
- Electronic, Optical and Magnetic Materials
- Condensed Matter Physics