Study of the strongly correlated electron system UCu5Sn

We report on measurements of magnetisation and magnetoresistance of the Kon do lattice compound UCu5Sn, being magnetically ordered at T-C approximate t o 54 K and showing an enhanced value of the linear term in the specific hea t at low temperatures. The magnetic ordered state is characterised by a lar ge ferromagnetic component of the magnetic structure and is related to a di stinct irreversibility of the ZFC and FC-magnetisation. The magnetoresistan ce, measured at T less than or equal to 3 K, changes its sign from positive to negative, while above this temperature it is always negative. This beha viour is supposed to be attributed to the presence of a transition from a c oherent to an incoherent scattering state at very low temperatures. (C) 199 9 Elsevier Science B.V. All rights reserved.