Crystal Structure and Physical Properties of U3T3Sn4 (T = Ni, Cu)   Single-Crystals
  Heat capacity experiments, crystal structure determination and transmission electron microscopy have been carried out on U3Cu3Sn4 single-crystals. U3Cu3Sn4 was confirmed to be a heavy-fermion antiferromagnet (TN=13(1) K) with a low temperature electronic heat capacity coefficient gamma=390 mJ/molUK2. Low temperature heat capacity experiments on a U3Ni3Sn4 single-crystal indicate that below 0.4 K there is a crossover between the previously observed non-Fermi liquid behavior and a Fermi liquid state. 
L. Shlyk, P. Estrela, J.C. Waerenborgh, L.E. De Long, A. de Visser,   D.P. Rojas, F. Gandra, M. Almeida