non-Local Quantum Criticality in Ce(Ru₁₋ₓ Feₓ)₂ Ge₂ (x = xc = 0.76)
Montfrooij, W. · Aronson, M. C. · Rainford, B. D. · Mydosh, J. A. · Murani, A. P. · Haen, P. · Fukuhara, T.
Original · EN
We present the results of inelastic neutron scattering measurements, performed near the antiferromagnetic quantum critical point in Ce(Ru₀.₂₄ Fe₀.₇₆)₂ Ge₂. Both local and long range fluctuations of the local moments are observed, but due to the Kondo effect only the latter are critical. We propose a phenomenological expression which fits the energy E, temperature T and wave vector q dependences of the generalized susceptibility chi(q,E,T), describing the non-Fermi liquid E/T scaling found at every wave vector.
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