Structural Critical Scattering Study of Mg-Doped CuGeO3

Дата и время публикации : 1999-01-18T20:33:10Z

Авторы публикации и институты :
Y. J. Wang
V. Kiryukhin
R. J. Birgeneau
T. Masuda
I. Tsukada
K. Uchinokura

Ссылка на журнал-издание: Ссылка на журнал-издание не найдена
Коментарии к cтатье: 5 pages, 4 embedded eps figures, to appear in PRL
Первичная категория: cond-mat.str-el

Все категории : cond-mat.str-el

Краткий обзор статьи: We report a synchrotron x-ray scattering study of the diluted spin-Peierls (SP) material Cu_(1-x)Mg_xGeO_3. We find that for x>0 the temperature T_m at which the spin gap is established is significantly higher than the temperature T_s at which the SP dimerization attains long-range order. The latter is observed only for x<x_c =0.021, while for x>x_c the SP correlation length quickly decreases with increasing x. We argue that impurity-induced competing interactions play a central role in these phenomena.

Category: Physics