PRESSURE EFFECT ON SUPERCONDUCTING PROPERTIES OF REBA1.5SR0.5CU3O6+X CERAMICS

The influence of pressure (up to 1 GPa) on the superconducting propert ies of ReBa1.5Sr0.5Cu3O6+x (Re = Y,Gd) ceramics has been studied in th e interval of T = 4-100 K. The pressure effect depends strongly on the oxygen contents. The dT(c)/dP = 20K/GPs (for Re = Y, x = 0.56) is the highest value for HTSC of 123 type. Under a prolonged action of press ure at room temperature the relaxation of T-c as well as hysteretic ph enomena with pressure have been observed. The relaxation times of T-c under pressure are determined. These effects are interpreted as being due to the oxygen ordering in CuO chains.