Site Specific X-ray Anomalous Dispersion of the Geometrically Frustrated Kagome Magnet, Herbertsmithite, ZnCu3(OH)6Cl2

被引：183

作者：

Freedman, Danna E. ^{[1
]}

Han, Tianheng H. ^{[2
]}

Prodi, Andrea ^{[2
]}

Mueller, Peter ^{[1
]}

Huang, Qing-Zhen ^{[3
]}

Chen, Yu-Sheng ^{[4
]}

Webb, Samuel M. ^{[5
]}

Lee, Young S. ^{[2
]}

McQueen, Tyrel M. ^{[1
]}

Nocera, Daniel G. ^{[1
]}

机构：

[1] MIT, Dept Chem, Cambridge, MA 02139 USA

[2] MIT, Dept Phys, Cambridge, MA 02139 USA

[3] NIST, Gaithersburg, MD 20899 USA

[4] Argonne Natl Lab, Adv Photon Source, Argonne, IL 60439 USA

[5] SLAC Natl Accelerator Lab, Menlo Pk, CA 94025 USA

来源：

JOURNAL OF THE AMERICAN CHEMICAL SOCIETY | 2010年 / 132卷 / 45期

基金：

美国国家科学基金会;

关键词：

CRYSTAL-STRUCTURE; CATION DISTRIBUTION; DIFFRACTION; SCATTERING; ADSORPTION; FERRITE;

D O I：

10.1021/ja1070398

中图分类号：

O6 [化学];

学科分类号：

0703 ;

摘要：

Structural characterization, exploiting X-ray scattering differences at elemental absorption edges, is developed to quantitatively determine crystallographic site-specific metal disorder. We apply this technique to the problem of Zn-Cu chemical disorder in ZnCu3(OH)(6)Cl-2. This geometrically frustrated kagome antiferromagnet is one of the best candidates for a spin-liquid ground state, but chemical disorder has been suggested as a mundane explanation for its magnetic properties. Using anomalous scattering at the Zn and Cu edges, we determine that there is no Zn occupation of the intralayer Cu sites within the kagome layer; however there is Cu present on the Zn intersite, leading to a structural formula of (Zn0.85Cu0.15)-Cu-3(OH)(6)Cl-2. The lack of Zn mixing onto the kagome lattice sites lends support to the idea that the electronic ground state in ZnCu3(OH)(6)Cl-2 and its relatives is nontrivial.

引用

页码：16185 / 16190

页数：6

共 41 条

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