Dramatic change of the magnetic response in LiV2O4: Possible heavy fermion to itinerant d-metal transition

Abstract

The magnetic relaxation of the d-metal oxide LiV2O4has been measured by means of quasielastic neutron scattering. At low temperatures, the observed residual linewidth of 0.5 meV and a square-root temperature dependence of the magnetic relaxation rate are canonical features of heavy-fermion systems. For T > 40K the magnetic response changes dramatically and can be characterized as a metal close to ferromagnetic order. © 1999 The American Physical Society.