Impurity-induced antiferromagnetism was observed in the S = 1/2 alternating chain compound NaCu₂VP₂O₁₀ when a few nonmagnetic ions were substituted at the Cu sites. NaCu₂VP₂O₁₀ showed a nonmagnetic spin-singlet ground state at low temperatures. The temperature dependence of the magnetic susceptibility and the specific heat of the Mg-doped compounds, Na(Cu_1−xMg_x)₂VP₂O₁₀ \((x = 0.03,0.05)\), showed anomalies at ∼8 K, indicating antiferromagnetic ordering.

中文翻译：

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S = 1/2 交替链系统 NaCu2VP2O10 中的杂质诱导反铁磁性

当一些非磁性离子在 Cu 位点被取代时，在S = 1/2 交替链化合物 NaCu ₂ VP ₂ O ₁₀中观察到杂质诱导的反铁磁性。NaCu ₂ VP ₂ O ₁₀在低温下表现出非磁性自旋单线基态。Mg 掺杂化合物 Na(Cu _{1− x} Mg _x ) ₂ VP ₂ O _{10 的}磁化率和比热的温度依赖性 \((x = 0.03,0.05)\)，在~8 K 处显示异常，表明反铁磁有序。