Neutron scattering study of the diffuse critical scattering associated with the Verwey transition in magnetite (Fe3O4)
Neutron scattering study of the diffuse critical scattering associated with the Verwey transition in magnetite (Fe3O4)
复制标题
与磁铁矿 (Fe3O4) 中 Verwey 转变相关的扩散临界散射的中子散射研究
DOI：
10.1103/physrevb.14.200
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发表时间：
1976
影响因子：
3.7
通讯作者：
G. Shirane
中科院分区：
文献类型：
--
作者：
S. Shapiro;M. Iizumi;G. Shirane
用中子散射实验研究了磁铁矿(Fe3O4)中Verwey有序化(TV=122K)的温度相关弥散临界散射。散射的Q依赖关系表明，它本质上是平面的，并表明它是由沿立方体边缘的一维(1-D)关联产生的。扩散散射在高温下(T−，T V<；100K)是可观察到的，并且随着T V的接近而迅速增加。在TV附近，出现了Fujii等人研究的斑点状三维临界散射。在T_V时，漫散射突然减小，在T_V以下不存在。非弹性研究表明，扩散散射主要是非弹性的，并与扩散散射面上随Q传播的横向声子强烈耦合。用赝旋-声子理论对光谱进行了解释，得到了有意义的参数。
The temperature-dependent diffuse critical scattering associated with the Verwey ordering (T V= 122 K) in magnetite (Fe 3 O 4) is extensively studied by means of neutron scattering experiments. The q dependence of the scattering reveals that it is planar in nature and shown to arise from one-dimensional (1-D) correlations along a cube edge. The diffuse scattering is observable at high temperatures (T− T V< 100 K) and increases rapidly as T V is approached. Near T V, the spotlike 3-D critical scattering studied by Fujii etal appears. At T V the diffuse scattering shows an abrupt decrease and is absent below. Inelastic studies show that the diffuse scattering is predominantly inelastic and couples strongly to the transverse acoustic phonons propagating with q in the plane of diffuse scattering. The spectra are interpreted via a pseudospin-phonon theory and the significant parameters are derived.