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.

arXiv commentHeavy Fermion, Quantum Critical Phenomenon

References in corpus (13)

• Magnetic Order versus superconductivity in the Iron-based layered La(O1-xFx)FeAs systems
• Fermi-liquid instabilities at magnetic quantum phase transitions
• Quantum Criticality in Heavy Fermion Metals
• Locally critical quantum phase transitions in strongly correlated metals
• The break up of heavy electrons at a quantum critical point
• Onset of antiferromagnetism in heavy fermion metals
• Quantum criticality
• Quantum Magnetic Excitations from Stripes in Copper-Oxide Superconductors
• Magnetically driven superconductivity in CeCu2Si2
• Antiferromagnetic criticality at a heavy-fermion quantum phase transition
• Continuous quantum phase transition in a Kondo lattice model
• Anomalous scaling behavior of the dynamical spin susceptibility of Ce${}_{0.925}$La${}_{0.075}$Ru${}_2$Si${}_2$
• A Fermi Sea of Heavy Electrons (a Kondo Lattice) is Never a Fermi Liquid

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• Doping-induced redistribution of magnetic spectral weight in substituted hexaborides Ce${}_{1-x}$La${}_x$B${}_6$ and Ce${}_{1-x}$Nd${}_x$B${}_6$
• Multiple Magnetic Structures of Correlated Ce-ions in Intermetallic CeAu2Ge2
• Anomalous frequency and temperature dependent scattering and Hund's coupling in the almost quantum critical heavy fermion system CeFe${}_2$Ge${}_2$
• CeCu_2Ge_2: Challenging our Understanding of Quantum Criticality
• A Local Quantum Phase Transition in YFe${}_2$Al${}_{10}$
• Fermi surface reconstruction and dimensional topology change in Nd-doped CeCoIn${}_5$
• Reduction of the ordered-magnetic moment and its relationship to Kondo coherence in Ce${}_{1-x}$La${}_x$Cu${}_2$Ge${}_2$
• Anisotropic magnetic properties and crystal electric field studies on CePd${}_2$Ge${}_2$ single crystal
• Interplay of spin gap and nanoscopic quantum fluctuations in intermetallic CeCu2Ge2
• Quantum continuum fluctuations in glassy perovskite Ca(Co${}_{0.15}$Ru${}_{0.85}$)O${}_3$
• Magnetic Field Dependence of the Spin Fluctuations in CeCu${}_{5.8}$Ag${}_{0.2}$