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Quantum Critical Behavior in Ce(Fe0.76Ru0.24)2Ge2



Wouter Montfrooij, Tom Heitmann, Yiming Qiu, Shannon M. Watson, Ross Erwin, Wangchun Chen, Yang Zhao, Meigan Aronson, Yingkai Huang, Anne de Visser


Systems with embedded magnetic ions that exhibit a competition between magnetic order and disorder down to absolute zero can display unusual low temperature behaviors of the resistivity, hyperscaling behavior in which the relaxation back to equilibrium when an amount of energy E is given to the system at temperature Τ on depends on the ration Ε/Τ. Ce(Fe0.755Ru0.245)2Ge2 is a system that displays these behaviors. In here, we show that these complex behaviors are rooted in a fragmentation of the magnetic lattice upon cooling caused by Kondo screening, and that the clusters that spontaneously form and order upon cooling. We present our arguments based on the review of two-decades worth of neutron scattering and transport data on this system, augmented with new polarized neutron scattering experiments.
Physical Review B


quantum critical point, kondo screening, neutron scattering


Montfrooij, W. , Heitmann, T. , Qiu, Y. , Watson, S. , Erwin, R. , Chen, W. , Zhao, Y. , Aronson, M. , Huang, Y. and de Visser, A. (2019), Quantum Critical Behavior in Ce(Fe<sub>0.76</sub>Ru<sub>0.24</sub>)<sub>2</sub>Ge<sub>2</sub>, Physical Review B, [online], (Accessed May 21, 2024)


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Created May 6, 2019, Updated October 12, 2021