Novel S = 1/2 Kagome Lattice Materials: Cs2TiCu3F12 and Rb2TiCu3F12

Crystals

Lewis J. Downie³  Elena I. Ardashnikova²  Chiu C. Tang⁵  Alexandre N. Vasiliev⁴  Peter S. Berdonosov²  Valery A. Dolgikh²  Mark A. de Vries¹  Philip Lightfoot³ 

[1]School of Chemistry and EaStChem, University of Edinburgh, Edinburgh EH9 3JZ, UK

[2] E-Mail:

[3]Department of Chemistry, M. V. Lomonosov Moscow State University, 119991 GSP-1 Moscow, Russia

[4] E-Mails:

[5]School of Chemistry and EaStChem, University of St Andrews, St Andrews KY16 9ST, UK

[6] E-Mail:

[7]Department of Low Temperature Physics and Superconductivity, Physics Faculty, M. V. Lomonosov Moscow State University, 119991 GSP-1 Moscow, Russia

[8] E-Mail:

[9]Diamond Light Source Ltd., Harwell Science and Innovation Campus, Didcot OX11 0DE, UK

[10] E-Mail:

关键词: kagome lattice;    magnetic;    fluoride;    phase transition;   

DOI  :  10.3390/cryst5020226

来源: mdpi

【 摘 要 】

Two new members of the A₂B′Cu₃F₁₂ family of kagome-related materials have been prepared, in order to further understand the crystal-chemical relationships, phase transitions and magnetic behaviour within this family of potentially frustrated S = ½ two-dimensional quantum magnets. Cs₂TiCu₃F₁₂ adopts a crystal structure with the ideal kagome lattice topology (space group Rm) at ambient temperature. Diffraction studies reveal different symmetry-lowering structural phase transitions in single crystal and polycrystalline forms at sub-ambient temperatures, with the single crystal form retaining rhombohedral symmetry and the powder form being monoclinic. In both cases, long-range antiferromagnetic order occurs in the region 16–20 K. Rb₂TiCu₃F₁₂ adopts a distorted triclinic structure even at ambient temperatures.

【 授权许可】

CC BY   
© 2015 by the authors; licensee MDPI, Basel, Switzerland.