- Journal Article
The influence of bond randomness on long-range magnetic ordering in the weakly coupled S=1/2 antiferromagnetic spin chain materials Cu(py) 2(Cl1-xBrx)2 is studied by muon spin rotation and bulk measurements. Disorder is found to have a strong effect on the ordering temperature TN, and an even stronger one on the saturation magnetization m0, 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 predictions. In this context, we discuss the possibility of a universal distribution of ordered moments in the weakly coupled random singlet chains model. Show more
Journal / seriesPhysical Review B
Pages / Article No.
PublisherAmerican Physical Society
Organisational unit03855 - Zheludev, Andrey / Zheludev, Andrey
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