Universal Charge and Spin Response in Optimally Doped Antiferromagnets

Дата и время публикации : 1995-07-11T17:03:08Z

Авторы публикации и институты :
J. Jaklic (J. Stefan Institute)
P. Prelovsek (J. Stefan Institute)

Ссылка на журнал-издание: Phys. Rev. Lett. 75, 1340 (1995)
Коментарии к cтатье: 12 pages, REVTEX, 4 Postscript figures in a separate uufile
Первичная категория: cond-mat

Все категории : cond-mat

Краткий обзор статьи: Charge and spin response in the planar $t-J$ model at finite temperatures are investigated numerically, in the regime corresponding to cuprates at intermediate doping. We show that the local spin correlation function is $T$-independent, leading to $chi”(omega<J) propto tanh (omega/2 T)$. The current correlation function $C(omega)$ appears to be $T$- as well as $omega$-independent, and the optical conductivity $sigma propto (1- e^{-omega/T})/omega$. Such anomalous response functions are brought in connection with the large entropy persisting at $T<J$.

Category: Physics