Abstract
In the superconducting oxides the value of Tc may be a sensitive function of both the concentration and the distribution of oxygen defects, the latter quantity itself being a function of both temperature and pressure. Recent high-pressure experiments on Tl2Ba2CuO6+y have revealed distinct low- and high-temperature relaxation processes above 15 K, presumably originating in the oxygen sublattice. In TlSr2CaCu2O7-y and YBa2Cu3O6, 41 only relaxation above 250 K is observed. The relaxation time τ in YBa2Cu3O6, 41 is found to increase rapidly with pressure from approximately 10 hours at 1 bar to 550 hours at 2. 3 GPa. In systems where such relaxation effects occur, Tc is thus not a unique function of pressure, but rather depends in a complicated way on the pressure-thermal-time prehistory of the sample.
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