The dynamic spin correlations in the quasi-one-dimensional quantum antiferromagnet BaCu2(Si0.5Ge0.5)O7, where the exchange constant fluctuates due to a random distribution of Si and Ge atoms, were analyzed. The measured low-energy spectrum was discussed in the framework of the random singlet model. It was found that the spinon continuum ion the quantum model was approximated using the Müller ansatz function. Analyis shows the observed scaling relations for the frequency dependencies of the correlation length and structure factor were in agreement with theoretical predictions.
ASJC Scopus subject areas
- Physics and Astronomy(all)