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Crystal structure and magnetic properties of the coupled spin dimer compound SrCu2(TeO3)2Cl2 |
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| Authors: | Rie Takagi Reinhard K Kremer |
| Institution: | a Department of Inorganic Chemistry, Stockholm University, S-10691 Stockholm, Sweden b Max Planck Institute for Solid State Research, Heisenbergstrasse 1, D-70569 Stuttgart, Germany c Institute for Physics of Condensed Matter, TU Braunschweig, Mendelssohnstr. 3, D-38106 Braunschweig, Germany |
| Abstract: | Single crystals of the strontium copper tellurium oxochloride SrCu2(TeO3)2Cl2 were synthesized via solid-gas reactions in sealed evacuated silica tubes. The compound crystallizes in the monoclinic system, space group P21, a=7.215(2), b=7.2759(15), c=8.239(2) Å, β=96.56(4)°, Z=2. The building units are SrO6Cl2] irregular polyhedra, CuO4] and CuO3Cl] square planes, TeO3E] tetrahedra and TeO3+1E] trigonal bipyramids; E being the 5s2 lone pair of Te(IV). The Cu atoms can be regarded as forming a chain of weakly connected dimers. The magnetic susceptibility of the compound shows a broad maximum typical for antiferromagnetic spin fluctuations with a non-magnetic ground state. A Heisenberg spin model with coupled s=1/2 dimers leads to a satisfactory fitting of the experimental data. |
| Keywords: | Oxohalide Lone pair elements Crystal structure Spin dimers Antiferromagnetism |
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