The quantum spin continuum and classical spin freezing, associated with a glassy state, represent two opposite extremes of a correlated electronic material. Here, we report the coexistence of a quantum spin continuum with a weak spin glass order in Co-doped CaRuO3 perovskite near the chemical doping dependent metal-insulator transition boundary. Inelastic neutron measurements on Ca(Co0.15Ru0.85)O3 at low temperature, T = 1.5 K, reveal a continuum spectrum in the Q−E space due to uncorrelated spin fluctuations. This persists across the glass transition at TG≃23 K. Furthermore, scaling of the dynamic susceptibility yields a very small scaling coefficient α≃ 0.1, suggesting extreme locality of the dynamic properties. The experimental results indicate the realization of a narrow regime where the distinction between continuum dynamic behavior and glass-like regimes is reduced.
@article{arxiv.1807.05404,
title = {Quantum continuum fluctuations in glassy perovskite Ca(Co$_{0.15}$Ru$_{0.85}$)O$_{3}$},
author = {Yiyao Chen and A. Dahal and J. Rodriguez-Rivera and G. Xu and T. Heitmann and V. Dugaev and A. Ernst and D. J. Singh and D. K. Singh},
journal= {arXiv preprint arXiv:1807.05404},
year = {2018}
}