量子自旋链作为Nersesyan-Tsvelik模型的潜在实现
Quantum spin chain as a potential realization of the Nersesyan-Tsvelik model
摘要：
已经确定的是，在相互作用是低维的磁性系统中，长程磁序被抑制。典型的例子是S-1/2海森堡反铁磁链（S-1/2 HAFC），它的基态是量子临界的。在真实的S-1/2 HAFC化合物中，链间耦合诱导了长程磁有序，尽管与居里-外斯温度相比，有序矩和Néel温度被抑制。最近，有人提出，如果链间的相互作用受到挫折，秩序也可以被抑制，如Nersesyan-Tsvelik模型。本文研究了新型的S-1/2型HAFC，（NO）[Cu（NO3）3]。这种材料显示出对秩序的极端压制，而且是不相称的，揭示了与Nersesyan-Tsvelik模型一致的挫折感的存在。
英文摘要：
It is well established that long-range magnetic order is suppressed in magnetic systems whose interactions are low-dimensional. The prototypical example is the S-1/2 Heisenberg antiferromagnetic chain (S-1/2 HAFC) whose ground state is quantum critical. In real S-1/2 HAFC compounds interchain coupling induces long-range magnetic order although with a suppressed ordered moment and reduced Néel temperature compared to the Curie-Weiss temperature. Recently, it was suggested that order can also be suppressed if the interchain interactions are frustrated, as for the Nersesyan-Tsvelik model. Here, we study the new S-1/2 HAFC, (NO)[Cu(NO3)3]. This material shows extreme suppression of order which furthermore is incommensurate revealing the presence of frustration consistent with the Nersesyan-Tsvelik model.
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