Lowering of the spatial symmetry at the gamma - alfa phase transition in ceriumстатья
Статья опубликована в высокорейтинговом журнале
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Дата последнего поиска статьи во внешних источниках: 19 июля 2013 г.
Аннотация:Using time-differential perturbed angular correlation spectroscopy we have measured the electric field gradient EFG at 111Cd 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 phase is almost four times larger than in the cubic phase and close to values in the noncubic phases and . 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 → transition while the lattice remains face-centered cubic.