Third order dielectric susceptibility in a model quantum paraelectric

Дата и время публикации : 1996-02-15T16:57:05Z

Авторы публикации и институты :
R. Martonak
E. Tosatti

Ссылка на журнал-издание: Ссылка на журнал-издание не найдена
Коментарии к cтатье: 22 pages
Первичная категория: mtrl-th

Все категории : mtrl-th, cond-mat.mtrl-sci

Краткий обзор статьи: In the context of perovskite quantum paraelectrics, we study the effects of a quadrupolar interaction $J_q$, in addition to the standard dipolar one $J_d$. We concentrate here on the nonlinear dielectric response $chi_{P}^{(3)}$, as the main response function sensitive to quadrupolar (in our case antiquadrupolar) interactions. We employ a 3D quantum four-state lattice model and mean-field theory. The results show that inclusion of quadrupolar coupling of moderate strength ($J_q sim {{1}over{4}} J_d$) is clearly accompanied by a double change of sign of $chi_{P}^{(3)}$ from negative to positive, near the quantum temperature $T_Q$ where the quantum paraelectric behaviour sets in. We fit our $chi_{P}^{(3)}$ to recent experimental data for SrTiO$_3$, where the sign change is identified close to $T_Q sim 37 K$.

Category: Physics