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Ordering in weakly coupled random singlet spin chains

机译:弱耦合随机单重态自旋链中的有序

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The influence of bond randomness on long-range magnetic ordering in the weakly coupled S=1/2 antiferromagnetic spin chain materials Cu(py)2(Cl_(1-x)Br_x)_2 is studied by muon spin rotation and bulk measurements. Disorder is found to have a strong effect on the ordering temperature T_n, and an even stronger one on the saturation magnetization m_0, but considerably more so in the effectively lower-dimensional Br-rich materials. The observed behavior is attributed to random singlet ground states of individual spin chains, but remains in contradiction with chain mean-field theory [Joshi and Yang, Phys. Rev. B 67, 174403 (2003)] predictions. In this context, we discuss the possibility of a universal distribution of ordered moments in the weakly coupled random singlet chains model.
机译:通过μ自旋旋转和体积测量研究了键耦合随机性对弱耦合S = 1/2反铁磁自旋链材料Cu(py)2(Cl_(1-x)Br_x)_2中长距离磁有序的影响。发现无序对有序温度T_n有很强的影响,对饱和磁化强度m_0有更强的影响,但是在有效地降低维数的富含Br的材料中无序的影响更大。观察到的行为归因于单个自旋链的随机单重态基态,但仍与链均值场理论相矛盾[Joshi and Yang,Phys。 B 67,174403(2003)]预测。在这种情况下,我们讨论了弱耦合随机单重链模型中有序矩的普遍分布的可能性。

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