Crystal structure and magnetic properties of the coupled spin dimer compound SrCu2(TeO3)2Cl2

✍ Scribed by Rie Takagi; Mats Johnsson; Reinhard K. Kremer; Peter Lemmens

• Publisher: Elsevier Science
• Year: 2006
• Tongue: English
• Weight: 313 KB
• Volume: 179
• Category: Article
• ISSN: 0022-4596
• DOI: 10.1016/j.jssc.2006.08.017

✦ Synopsis

Single crystals of the strontium copper tellurium oxochloride SrCu 2 (TeO 3 ) 2 Cl 2 were synthesized via solid-gas reactions in sealed evacuated silica tubes. The compound crystallizes in the monoclinic system, space group P2 1 , a

The building units are [SrO 6 Cl 2 ] irregular polyhedra, [CuO 4 ] and [CuO 3 Cl] square planes, [TeO 3 E] tetrahedra and [TeO 3+1 E] trigonal bipyramids; E being the 5s 2 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 ¼ 1/2 dimers leads to a satisfactory fitting of the experimental data.