Atomic structure of the i-R-Cd quasicrystals and consequences for magnetism
Atomic structure of the i-R-Cd quasicrystals and consequences for magnetism
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i-R-Cd 准晶体的原子结构及其对磁性的影响
DOI：
10.1103/physrevb.94.060103
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发表时间：
2016
影响因子：
3.7
通讯作者：
A. I. Goldman
中科院分区：
文献类型：
--
作者：
T. Yamada;H. Takakura;T. Kong;P. Das;W. T. Jayasekara;A. Kreyssig;G. Beutier;P. C. Canfield;M. de Boissieu;A. I. Goldman
我们报告了通过单晶样品的同步加速器 X 射线衍射对 i-Cd 准晶 (= Gd、Dy、Tm) 的三个成员进行六维 (6D) 结构细化，并表明该系列与 i-准晶是同构的。然而，我们的改进表明，Tsai 型原子簇内 Yb 二十面体位点的占据率约为 80%，其余部分由 Cd 占据。 i--Cd系列与i-之间的相似性以及与i-和i-之间的差异表明，Tsai型二十面体准晶至少存在两个子类。我们进一步通过对一组密切相关的 1/1 近似相的 X 射线共振磁散射 (XRMS) 测量表明，非磁性 Y 对 Tsai 型簇内二十面体上的磁离子的稀释破坏了近似相中相应的磁排序。
We report on the six-dimensional (6D) structural refinement of three members of the i--Cd quasicrystals (= Gd, Dy, Tm) via synchrotron x-ray diffraction from single-grain samples, and show that this series is isostructural to the i-quasicrystal. However, our refinements suggest that theoccupancy on the Yb icosahedron sites within the Tsai-type atomic cluster is approximately 80%, with the balance taken up by Cd. Similarities between the i--Cd series and i-, and their differences with i-and i-, indicate that there are at least two subclasses of Tsai-type icosahedral quasicrystals. We further show from x-ray resonant magnetic scattering (XRMS) measurements on a set of closely related1/1 approximants that the dilution of the magneticions on the icosahedron within the Tsai-type cluster by nonmagnetic Y disrupts the commensurate magnetic ordering in the approximant phase.