We have measured 63Cu-NQR spectral lines and nuclear spin-lattice relaxation time T1 under pressure up to 5.4 GPa. Daphne oil 7474 is used as the pressure-transmitting medium to obtain good hydrostaticity. NQR frequency 63νq above 4 GPa suddenly decreases from the linear pressure dependence in the low pressure range (P ≤ 3.5 GPa). The observed sudden downward deviation of 63νq is associated with an increase of Ce valence. Above 4.5 GPa, the linear pressure dependence of 63νq is observed again, most likely related to the sharp crossover to the high valence state.
|Journal||Journal of Physics: Conference Series|
|Publication status||Published - 2012|
|Event||International Conference on Strongly Correlated Electron Systems, SCES 2011 - Cambridge, United Kingdom|
Duration: 2011 Aug 29 → 2011 Sept 3