Novel S = 1/2 kagome lattice materials : Cs2TiCu3F12 and Rb2TiCu3F12
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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 R m) 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.
Downie , L J , Ardashnikova , E I , Tang , C C , Vasiliev , A N , Berndonosov , P S , Dolgikh , V A , de Vries , M A & Lightfoot , P 2015 , ' Novel S = 1/2 kagome lattice materials : Cs 2 TiCu 3 F 12 and Rb 2 TiCu 3 F 12 ' Crystals , vol 5 , no. 2 , pp. 226-243 . DOI: 10.3390/cryst5020226
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The collaboration between the University of St Andrews and Moscow State University was funded by a Royal Society International Exchanges grant, in collaboration with the Russian Foundation for Basic Research (12-03-92604). Lewis Downie thanks the EPSRC for a Ph.D. studentship via a Doctoral Training grant (EP/P505097/1). This work was carried out with the support of the Diamond Light Source, beamtime application EE7980. Alexandre Vasiliev acknowledges support of RFBR through grants Numbers 13-02-00174, 14-02-92002 and 14-02-92693.
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