DC conductivity measurements between 15 and 300 K are reported for SmBa2Cu306+J samples with different oxygen doping amounts (x) produced by annealing under appropriate high temperature and oxygen pressure conditions and quenching. Samples with jc>0.5 are superconductors: 7*c~60 K at Jt=0.7, 7*c>80 K at ;c=0.9. The transition from superconduction to non-superconduction corresponds to the tetrag...
