Less than 50% sublattice polarization in an insulating S=3/2 kagome’ antiferromagnet at low T

Дата и время публикации : 1997-05-01T22:54:32Z

Авторы публикации и институты :
S. -H. Lee
C. Broholm
M. F. Collins
L. Heller
A. P. Ramirez
C. Kloc
E. Bucher
R. W. Erwin
N. Lacevic

Ссылка на журнал-издание: Ссылка на журнал-издание не найдена
Коментарии к cтатье: 18 pages, RevTex/Latex, with 6 figures
Первичная категория: cond-mat.str-el

Все категории : cond-mat.str-el

Краткий обзор статьи: We have found weak long range antiferromagnetic order in the quasi-two-dimensional insulating oxide $ KCr_3(OD)_6(SO_4)_2$ which contains Cr$^{3+}$ S=3/2 ions on a kagom’{e} lattice. In a sample with $approx$ 76% occupancy of the chromium sites the ordered moment is 1.1(3)$mu_B$ per chromium ion which is only one third of the N’{e}el value $gmu_BS=3mu_B$. The magnetic unit cell equals the chemical unit cell, a situation which is favored by inter-plane interactions. Gapless quantum spin-fluctuations ($Delta/k_B <0.25$K) with a bandwidth of 60K >> $T_N$ = 1.6K are the dominant contribution to the spin correlation function, $S(Q,omega)$ in the ordered phase.

Category: Physics