MAGNETIC EXCITATIONS IN CUGEO3

被引：13
|
作者：
NISHI, M [1 ]
FUJITA, O [1 ]
AKIMITSU, J [1 ]
KAKURAI, K [1 ]
FUJII, Y [1 ]
机构：
[1] AOYAMA GAKUIN UNIV,DEPT PHYS,TOKYO 157,JAPAN
来源：
PHYSICA B | 1995年 / 213卷
关键词：
D O I：
10.1016/0921-4526(95)00128-V
中图分类号：
O469 [凝聚态物理学];
学科分类号：
070205 ;
摘要：
In the inorganic spin-Peierls compound CuGeO3, we found a pronounced anisotropic magnetic energy dispersion, i.e. intra-chain exchange J(c) approximate to 10.4meV, inter-chain exchanges J(b) approximate to 0.1J(c), and J(a) approximate to -0.01J(c) and gap energy 2.1meV extrapolated to T = O K. We also observed critical scattering at (0,1,1/2) above T-sp. The ratio of the correlation lengths xi(c)/xi(b) is in good agreement with that obtained from X-ray scattering at (1/2,1,1/2) by Pouget et al. This fact suggests that the Cu2+ spins fluctuate to form singlet-pair short-range order, but not to form ordinary antiferromagnetic order above T-sp.
引用
收藏
页码：275 / 277
页数：3
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