Neutron-scattering study of magnetism in single-crystal Cu1-xZnxGeO3
Neutron-scattering study of magnetism in single-crystal Cu1-xZnxGeO3
复制标题
单晶 Cu1-xZnxGeO3 磁性的中子散射研究
DOI：
10.1143/jpsj.65.1392
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发表时间：
1996
影响因子：
1.7
通讯作者：
G. Shirane
中科院分区：
文献类型：
--
作者：
M. Hase;K. Uchinokura;R. Birgeneau;K. Hirota;G. Shirane
最近对掺Zn的自旋Peierls材料CuGeO 3单晶的磁化率的研究表明，低温下是反铁磁有序的。在本出版物中，我们报告的静态和动态磁性能的单晶Cu 0.966 Zn 0.034 GeO 3的中子散射调查。在转变温度4.2 ± 0.3K以下，在磁超晶格位置（0 kl/2）观察到尖锐的磁布拉格峰，其中k和l都是奇数。然而，即使在1.4 K下，这些峰的强度也不饱和，并且长程有序磁矩仅为每个Cu位B = 0.2 μ B。此外，没有明确定义的自旋波样激发。相反，过阻尼磁激发出现在低温下的磁布拉格峰周围。这些结果表明，一个不寻常的状态，磁秩序纳入相当大的磁性和可能的结构紊乱。我们推测，这种不寻常的顺序是由自旋状态的空间分布引起的。
A recent study of the magnetic susceptibility in single crystals of the spin-Peierls material CuGeO 3 doped with Zn indicates antiferromagnetic order at low temperatures. In the present publication, we report a neutron scattering investigation of the static and dynamic magnetic properties of single-crystal Cu 0.966 Zn 0.034 GeO 3 . Below the transition temperature of 4.2 ± 0.3 K, sharp magnetic Bragg peaks are observed at the magnetic superlattice positions (0 k l /2) with both k and l odd. However, the intensities of these peaks are not saturated even at 1.4 K, and the long range ordered magnetic moment is only ∼0.2 µ B per Cu site. Moreover, no well-defined spin-wave-like excitations are seen. Instead, overdamped magnetic excitations appear around the magnetic Bragg peaks at low temperatures. These results suggest an unusual state of magnetic order incorporating considerable magnetic and possibly structural disorder. We speculate that this unusual order is caused by a spatial distribution of spin states...