Erratum: Dynamics and scaling in a quantum spin chain material with bond   randomness
  Follow-up neutron measurements, performed on a sample much larger than the one used in the original study, show that in the energy range 0.5-45 meV the magnetic excitations in BaCu2SiGeO7 are indistinguishable from those in conventional (disorder-free) quantum S=1/2 chains. Scrutinizing the previous data, we found that the analysis was affected by a poorly identified structured background and an additional technical mistake in the data reduction. 
T. Masuda, A. Zheludev, K. Uchinokura, J.-H. Chung, S. Park