Field-induced quantum fluctuations in the heavy fermion superconductor CeCu2Ge2

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 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.

Heavy Fermion, Quantum Critical Phenomenon

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• Fermi-liquid instabilities at magnetic quantum phase transitions
• Quantum Criticality in Heavy Fermion Metals
• Quantum criticality
• Magnetically driven superconductivity in CeCu2Si2
• Antiferromagnetic criticality at a heavy-fermion quantum phase transition
• Anomalous scaling behavior of the dynamical spin susceptibility of Ce${}_{0.925}$La${}_{0.075}$Ru${}_2$Si${}_2$

Cited by in corpus (4)

• Heavy fermions in high magnetic field
• Multiple Magnetic Structures of Correlated Ce-ions in Intermetallic CeAu2Ge2
• CeCu_2Ge_2: Challenging our Understanding of Quantum Criticality
• Magnetic Field Dependence of the Spin Fluctuations in CeCu${}_{5.8}$Ag${}_{0.2}$