Identification of a Marginal Fermi-Liquid in Itinerant Ferromagnet CoS2
  We report specific heat, resistivity and susceptibility measurements at different temperatures, magnetic fields, and pressures to provide solid evidence of CoS2 being a marginal Fermi liquid. The presence of a tricritical point in the phase diagram of the system provides an opportunity to test the spin fluctuation theory with a high limit of accuracy. A magnetic field suppresses the amplitude of the spin fluctuations and recovers conventional Fermi liquid behavior, connecting both states continuously. 
M. Otero-Leal, F. Rivadulla, M. Garcia-Hernandez, A. Pineiro, V.   Pardo, D. Baldomir, J. Rivas