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Published on: August 2, 2019
Field-induced quantum fluctuations in the heavy fermion superconductor CeCu(2)Ge(2)
D K Singh1, A Thamizhavel, J W Lynn
1NIST Center for Neutron Research, Gaithersburg, MD 20899, USA. dsingh@nist.gov
Abstract:
Quantum-mechanical fluctuations in strongly correlated electron systems cause unconventional phenomena such as non-Fermi liquid behavior, and arguably high temperature superconductivity. Here we report the discovery of a field-tuned quantum critical phenomenon in stoichiometric CeCu(2)Ge(2), a spin density wave ordered heavy fermion metal that exhibits unconventional superconductivity under ≃10 GPa of applied pressure. Our finding of the associated quantum critical spin fluctuations of the antiferromagnetic spin density wave order, dominating the local fluctuations due to single-site Kondo effect, provide new information about the underlying mechanism that can be important in understanding superconductivity in this novel compound.
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