Lowering of the spacial symmetry at the gamma-alpha phase transition in ceriumстатья
Статья опубликована в высокорейтинговом журнале
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Дата последнего поиска статьи во внешних источниках: 18 июля 2013 г.
Аннотация:Using time-differential perturbed angular correlation spectroscopy we have measured the electric field gradient (EFG) at $^{111}$Cd probe nuclei in solid Ce in a pressure range up to 8 GPa. Covering various allotropic phases of Ce, we find that the value of the EFG in the cubic $\alpha$-phase is almost four times larger than in the cubic $\gamma$-phase and close to values in the non cubic phases $\alpha'$ and $\alpha''$.
These results together with the differences in time modulation of the spectra are interpreted as evidence for quadrupolar electronic charge density ordering and symmetry lowering at the $\gamma \rightarrow \alpha$ transition while the lattice remains face-centered cubic.