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Structural phase transitions in the kagome lattice based materials Cs

DOI: 10.1039/C4CE00788C DOI Help

Authors: Lewis Downie (University of St Andrews) , Cameron Black (University of St Andrews) , E. I. Ardashnikova (Department of Chemistry, Moscow State University) , Chiu Tang (Diamond Light Source) , A. N. Vasiliev (Moscow State University) , A. N. Golovanov (Moscow State University) , P. S. Berdonosov (Department of Chemistry, Moscow State University) , V. A. Dolgikh (Department of Chemistry, Moscow State University) , P Lightfoot (University of St Andrews)
Co-authored by industrial partner: No

Type: Journal Paper
Journal: CrystEngComm , VOL 16 (32) , PAGES 6084-6089

State: Published (Approved)
Published: June 2014
Diamond Proposal Number(s): 7980

Abstract: The solid solution Cs2&#8722;xRbxSnCu3F12 (x = 0, 0.5, 1.0, 1.5) has been investigated crystallographically between 100 and 300 K using synchrotron X-ray powder diffraction and, in the case of x = 0, neutron powder diffraction. For Cs2SnCu3F12 (x = 0), there is a structural transition from the previously reported room temperature rhombohedral symmetry (R[3 with combining macron]m) to monoclinic (P21/n) symmetry at 170 K. This transformation is repeated for the x = 0.5 composition, but with an increased transition temperature of 250 K. For x = 1.0 the monoclinic phase is found at 300 K, suggesting that the transition temperature is increased even further. For x = 1.5 a different behaviour, more akin to that previously reported for Rb2SnCu3F12, is found: a single phase transition between rhombohedral symmetry (R[3 with combining macron]) and triclinic symmetry (P[1 with combining macron]) is found at 280 K. In agreement with previous single crystal studies, Cs2SnCu3F12 powder exhibits strong antiferromagnetic interactions (&#920; ~ &#8722;268 K) and long-range magnetic order at TN ~ 19.3 K. The finite magnetic moment observed for T < TN might be explained by a Dzyaloshinskii–Moriya interaction, due to the lowering of symmetry from rhombohedral to monoclinic, which was not suggested in the earlier single crystal study.

Subject Areas: Chemistry

Instruments: I11-High Resolution Powder Diffraction

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