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Identification of the Low-Energy Excitations in a Quantum Critical System



Tom Heitmann, Jagat Lamsal, Shannon M. Watson, Ross Erwin, Wangchun Chen, Yang Zhao, Wouter Montfrooij


We have identified low-energy magnetic excitations in a doped quantum critical system by means of polarized neutron scattering experiments. The presence of these excitations could explain why Cd(Fe0.76Ru0.24)2Ge2 displays dynamical scaling in the absence of local critical behavior or long-range spin-density wave criticality. The low-energy excitations are associated with the reorientations of the superspins of fully ordered, isolated magnetic clusters that form spontaneously upon lowering the temperature. The system houses both frozen clusters and dynamic clusters, as predicted by Hoyos and Vojta [Phys. Rev. B 74, 14041 (R) (2006)].
AIP Advances


quantum critical, hyperscaling


Heitmann, T. , Lamsal, J. , Watson, S. , Erwin, R. , Chen, W. , Zhao, Y. and Montfrooij, W. (2016), Identification of the Low-Energy Excitations in a Quantum Critical System, AIP Advances, [online], (Accessed April 13, 2024)
Created December 19, 2016, Updated October 12, 2021