Physics – Condensed Matter – Strongly Correlated Electrons
Scientific paper
2012-04-19
Scientific Report 1, 117 (2011)
Physics
Condensed Matter
Strongly Correlated Electrons
Heavy Fermion, Quantum Critical Phenomenon
Scientific paper
10.1038/srep00117
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 CeCu2Ge2, 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.
Dhar Sourav
Herman Ted
Lynn Jacob W.
Rodriguez-Rivera J.
Singh Deepak K.
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