Spin fluctuations in CuGeO$_3$ probed by light scattering

Дата и время публикации : 1996-10-17T11:24:22Z

Авторы публикации и институты :
Haruhiko Kuroe
Jun-ichi Sasaki
Tomoyuki Sekine
Naoki Koide
Yoshitaka Sasago
Kunimitsu Uchinokura
Masashi Hase

Ссылка на журнал-издание: Ссылка на журнал-издание не найдена
Коментарии к cтатье: 17 pages, REVTeX, 5 Postscript figures; in press in PRB
Первичная категория: cond-mat

Все категории : cond-mat

Краткий обзор статьи: We have measured temperature dependence of low-frequency Raman spectra in CuGeO$_3$, and have observed the quasi-elastic scattering in the $(c,c)$ polarization above the spin-Peierls transition temperature. We attribute it to the fluctuations of energy density in the spin system. The magnetic specific heat and an inverse of the magnetic correlation length can be derived from the quasi-elastic scattering. The inverse of the magnetic correlation length is proportional to $(T-T_{SP})^{1/2}$ at high temperatures. We compare the specific heat with a competing-$J$ model. This model cannot explain quantitatively both the specific heat and the magnetic susceptibility with the same parameters. The origin of this discrepancy is discussed.

Category: Physics