高分辨X射线衍射研究单晶CeFeAsO中的各向异性磁弹性耦合
Anisotropic magnetoelastic coupling in single-crystalline CeFeAsO as seen via high-resolution x-ray diffraction
摘要：
单晶同步辐射X射线衍射研究CeFeAsO揭示了沿或垂直于面内反铁磁（AFM）波矢的电荷相关长度在低温下的强各向异性，表明了各向异性的二维磁弹性耦合。高分辨率的设置允许清楚地监测每一个孪生域凭借它们之间的有限失配角，遵循序参量。此外，我们发现，在平面内的相关性，以上的正交（O）-tetraorbic（T）的转变，是短于那些在每个域中的AFM相，表明在平面内的晶格常数的分布。这有力地表明，以上的结构O-T转变的阶段实际上是T与强烈的O-T的波动，可能是由自旋波动引起的。
英文摘要：
Single-crystal synchrotron x-ray diffraction studies of CeFeAsO reveal strong anisotropy in the charge correlation lengths along or perpendicular to the in-plane antiferromagnetic (AFM) wave-vector at low temperatures, indicating an anisotropic two-dimensional magnetoelastic coupling. The high-resolution setup allows to distinctly monitor each of the twin domains by virtue of a finite misfit angle between them that follows the order parameter. In addition, we find that the in-plane correlations, above the orthorhombic (O)-to-tetragonal (T) transition, are shorter than those in each of the domains in the AFM phase, indicating a distribution of the in-plane lattice constants. This strongly suggests that the phase above the structural O-to-T transition is virtually T with strong O-T fluctuations that are probably induced by spin fluctuations.
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