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arXiv 1306.1762cond-mat.str-el
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SrHo2O4中的高阻挫磁性:两种短程有序的共存

Highly frustrated magnetism in SrHo2O4: Coexistence of two types of short-range order

O. Young, A. R. Wildes, P. Manuel, B. Ouladdiaf, D. D. Khalyavin, G. Balakrishnan, O. A. Petrenko

摘要:

SrHo 2 O 4是一种几何阻挫磁体,其中磁性Ho 3+离子形成通过锯齿形链网络连接的蜂窝层。在低温下,两种不同类型的短程磁序可以从单晶衍射数据中推断出来,这些数据是用极化和非极化中子收集的。在(hk 0)平面中,漫散射在k = 0位置附近最明显,并且其强度在低于0.7K的温度下迅速增加。此外,在高达4.5 K的温度下,可以看到Q =(hk +/- l/2)的漫散射平面。这些平面在低温下与(hk 0)平面中的漫散射的宽峰共存。在最低温度下,与宽峰相关的相关长度在a-b平面上为L ~ 150 nm,沿c轴为L ~ 190 nm,而与漫散射平面相关的相关长度沿c轴为L ~ 230 nm。两种类型的漫散射本质上都是弹性的。这两种类型的漫散射在SrHo 2 O 4中的极不寻常的共存可能是由于在晶胞中存在两个Ho 3+晶体学上不等价的位点。

英文摘要:

SrHo2O4 is a geometrically frustrated magnet in which the magnetic Ho3+ ions form honeycomb layers connected through a network of zigzag chains. At low-temperature two distinct types of short-range magnetic order can be inferred from single crystal diffraction data, collected using both polarized and unpolarized neutrons. In the (hk0) plane the diffuse scattering is most noticeable around the k = 0 positions and its intensity rapidly increases at temperatures below 0.7 K. In addition, planes of diffuse scattering at Q = (hk +/- l/2) are visible at temperatures as high as 4.5 K. These planes coexist with the broad peaks of diffuse scattering in the (hk0) plane at low-temperatures. Correlation lengths associated with the broad peaks are L ~ 150 Å in the a-b plane and L ~ 190 Å along c axis, while the correlation length associated with the diffuse scattering planes is L ~ 230 Å along the c axis at the lowest temperature. Both types of diffuse scattering are elastic in nature. The highly unusual coexistance of the two types of diffuse scattering in SrHo2O4 is likely to be the result of the presence of two crystallographically inequivalent sites for Ho3+ in the unit cell.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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