Nuclear physics research at CENS

Relaxor–super-paraelectric behaviour and crystal-field–driven spin-phonon coupling in pyrochlore Eu2Ti2O7

“…At lower temperature, the above-mentioned PNRs start interacting and due to dissimilar sizes, they respond in different manners with temperature variation as well as with varying external frequency. This feature is a signature behaviour of the super-paraelectric state of a system [31,38]. The super-paraelectric model demonstrates the existence of local symmetry breaking within a higher global symmetric matrix [38].…”

“…This feature is a signature behaviour of the super-paraelectric state of a system [31,38]. The super-paraelectric model demonstrates the existence of local symmetry breaking within a higher global symmetric matrix [38]. Thus, the emergence of a super-paraelectric state has been inferred for ETO instead of dipolar glass.…”

“…Another interesting behaviour that was also observed in the dielectric relaxor peak, is the asymmetrical diffused phase transition around T m . Mathematical assumption suggests that the size distribution of PNRs should follow the Gaussian profile and hence ε will be symmetric around T m [38]. In contrast, for ETO, in the temperature ranges T < T m and T > T m , we notice that the ε varies with different rates and it can be fitted with superposition of multiple Gaussian distributions around T m (fig.…”