Abstract
By measuring the nuclear magnetic resonance (NMR) relaxation rate in the Br (bond) doped DTN compound, , we show that the low-energy spin dynamics of its high magnetic field “Bose-glass” regime is dominated by a strong peak of spin fluctuations found at the nearly doping-independent position . From its temperature and field dependence, we conclude that this corresponds to a level crossing of the energy levels related to the doping-induced impurity states. Observation of the local NMR signal from the spin adjacent to the doped Br allowed us to fully characterize this impurity state. We have thus quantified a microscopic theoretical model that paves the way to better understanding of the Bose-glass physics in , as revealed in the related theoretical study [M. Dupont, S. Capponi, and N. Laflorencie, Phys. Rev. Lett. 118, 067204 (2017).].
- Received 7 July 2016
DOI:https://doi.org/10.1103/PhysRevLett.118.067203
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