Long range magnetic ordering in the quasi-one-dimensional random-bond antiferromagnet BaCu2(Si1−xGex)2O7 is studied in μSR experiments as a function of disorder strength. Compared to the disorder-free parent materials, the saturation ordered moment is found to be considerably reduced. Moreover, even in weakly disordered species, the magnetically ordered state is shown to be highly inhomogeneous. The results are interpreted in terms of weakly coupled random spin chains, governed by the ``infinite randomness`` fixed point.
@article{arxiv.1407.0813,
title = {Inhomogeneous ordering in weakly coupled Heisenberg $S=1/2$ chains with random bonds},
author = {M. Thede and T. Haku and T. Masuda and C. Baines and E. Pomjakushina and G. Dhalenne and A. Revcolevschi and E. Morenzoni and A. Zheludev},
journal= {arXiv preprint arXiv:1407.0813},
year = {2014}
}