磁场中SrDy2O4自旋关联的演化
Evolution of spin correlations in SrDy2O4 in an applied magnetic field
摘要：
利用中子衍射技术研究了外加磁场作用下阶梯型阻挫化合物SrDy_2 O_4的短程和长程磁有序的发展。在零场，SrDy 2 O 4缺乏长程磁序低至60 mK的温度，所观察到的粉末中子衍射（PND）图案是由非常广泛的漫散射峰为主。单晶中子衍射表明，零场磁结构由沿着c轴延伸的反铁磁链的集合组成，并且ab平面上的链之间的相关性很小。在外加磁场中，PND中的宽漫散射特征逐渐被更尖锐的峰所取代，然而，图案仍然相当复杂，反映了SrDy 2 O 4的高度各向异性性质。单晶中子衍射表明，沿b轴施加的中等磁场诱导与1/3磁化平台相关的向上-向上-向下磁序，其中ab平面中的磁相关长度显著增加，但它仍然是有限的。与铁磁排列相关的分辨率限制k = 0峰出现在2.5 T及以上的场中的粉末和单晶中子衍射图案中。
英文摘要：
The development of short- and long-range magnetic order induced in a frustrated zig-zag ladder compound SrDy2O4 by an applied field is studied using neutron diffraction techniques. In zero field, SrDy2O4 lacks long-range magnetic order down to temperatures as low as 60 mK, and the observed powder neutron diffraction (PND) patterns are dominated by very broad diffuse scattering peaks. Single crystal neutron diffraction reveals that the zero-field magnetic structure consists of a collection of antiferromagnetic chains running along the c axis and that there is very little correlation between the chains in the ab plane. In an applied magnetic field, the broad diffuse scattering features in PND are gradually replaced by much sharper peaks, however, the pattern remains rather complex, reflecting the highly anisotropic nature of SrDy2O4. Single crystal neutron diffraction shows that a moderate field applied along the b axis induces an up-up-down magnetic order associated with a 1/3-magnetisation plateau, in which magnetic correlation length in the ab plane is significantly increased, but it nevertheless remains finite. The resolution limited k = 0 peaks associated with a ferromagnetic arrangement appear in powder and single crystal neutron diffraction patterns in fields of 2.5 T and above.
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