title: Field-induced quantum fluctuations in the heavy fermion superconductor CeCu(2)Ge(2).
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.
authors.affiliation: NIST Center for Neutron Research, Gaithersburg, MD 20899, USA. dsingh@nist.gov
authors.forename: D K
authors.initials: DK
authors.lastname: Singh
authors.forename: A
authors.initials: A
authors.lastname: Thamizhavel
authors.forename: J W
authors.initials: JW
authors.lastname: Lynn
authors.forename: S
authors.initials: S
authors.lastname: Dhar
authors.forename: J
authors.initials: J
authors.lastname: Rodriguez-Rivera
authors.forename: T
authors.initials: T
authors.lastname: Herman