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

Published

Author(s)

Tom Heitmann, Jagat Lamsal, Shannon Watson, Ross W. Erwin, WangChun Chen, Yang Zhao, Wouter Montfrooij

Abstract

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)].
Citation
AIP Advances
Volume
7
Issue
5

Keywords

quantum critical, hyperscaling
Created December 20, 2016, Updated September 7, 2017