Interplay of spin gap and nanoscopic quantum fluctuations in intermetallic CeCu2Ge2

Abstract

Neutron scattering measurements are used to elucidate interplay of the field-induced spin gap and the quantum fluctuations in archetypal heavy electron system CeCu${}_2$Ge${}_2$. A spin gap of $\Delta$ = 0.56 meV is found to develop near the field-induced quantum critical state at $H$${}_c$$\simeq$ 8 T, driven by fluctuations of the long range antiferromagnetic order parameter. The superconducting transition temperature in many magnetic superconductors is found to exhibit one-to-one correspondence with the spin gap. In this regard, the demonstration of an interplay of the spin gap with the nanoscopic dynamic correlation provides new arena to explore direct relation between the quantum critical behavior and the unconventional superconductivity, especially in heavy electrons systems.

5 pages, 4 figures. arXiv admin note: text overlap with arXiv:1204.4375

References in corpus (8)

• Fermi-liquid instabilities at magnetic quantum phase transitions
• Quantum Criticality in Heavy Fermion Metals
• Quantum criticality
• Heavy Fermions and Quantum Phase Transitions
• Quantum correlations in spin chains at finite temperatures and quantum phase transitions
• Antiferromagnetic criticality at a heavy-fermion quantum phase transition
• Field-induced quantum fluctuations in the heavy fermion superconductor CeCu2Ge2
• Multiple Magnetic Structures of Correlated Ce-ions in Intermetallic CeAu2Ge2