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Ionic Size Effect on the Spin Gap Nature of SrCu2(TeO3)2Cl2
C. N. Kuo,S. C. Chen,C. S. Lue 한국물리학회 2013 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.62 No.12
By means of magnetic susceptibility measurements, we report the effects of partial substitutionof Br onto the Cl sites of SrCu2(TeO3)2Cl2. This material has been a subject of current interestdue to indications of a spin gap behavior. However, the magnetic spin couplings responsiblefor the spin gap nature remain unclear. For each composition of SrCu2(TeO3)2(Cl1−xBrx)2, thetemperature-dependent susceptibility exhibits a character of low-dimensional magnetism with abroad maximum at Tmax. The magnitude of Tmax slightly shifts to higher temperatures with increasingBr concentration. The experimental data can be well fitted to a coupled spin dimer model,yielding an increasing trend for the spin gap size from 172 to 188 K. This indicates that the substitutionof Br ions has the effect of reducing the distance between Cu(1) and Cu(2) ions, leading toa stronger antiferromagnetic spin interaction. On the other hand, the variation of the interdimercoupling is marginal, indicative of substituting Br ions having little effect on the distance changesof Cu(1)-Cu(1) and Cu(2)-Cu(2) in SrCu2(TeO3)2Cl2.