Almost critical spin fluctuations in normal state CeCu2Si2
Almost critical spin fluctuations are observed in CeCu2Si2 in the vicinity of the quantum critical point, when superconductivity is suppressed by a magnetic field. The magnetic excitation spectrum then is characterized by quasielastic magnetic fluctuations with an almost diverging lifetime for T ->0.
Spin Fluctuations in Normal State CeCu2Si2 on Approaching the Quantum Critical Point
J. Arndt, O. Stockert, K. Schmalzl, E. Faulhaber, H. S. Jeevan, C. Geibel, W. Schmidt, M. Loewenhaupt, F. Steglich
Phys. Rev. Lett. 106, 246401 (2011)