Impurity-Induced Antiferromagnetic Ordering in the Spin Gap System TlCuCl₃

الأصل · EN

The magnetization measurements have been performed on the doped spin gap system TlCu₁₋ₓMgₓCl₃ with x <= 0.025. The parent compound TlCuCl₃ is a three-dimensional coupled spin dimer system with the excitation gap Delta/kB = 7.7 K. The impurity-induced antiferromagnetic ordering was clearly observed. The easy axis lies in the (0,1,0) plane. It was found that the transition temperature increases with increasing Mg²⁺ concentration x, while the spin-flop transition field is almost independent of x. The magnetization curve suggests that the impurity-induced antiferromagnetic ordering coexists with the spin gap for x <= 0.017.