Abstract
Y 2Ba 4Cu 7O 15−δ superconductors with similar oxygen contents but different T c values have been produced by varying the reaction conditions. Resistivity, 89Y NMR and thermopower measurements were used to ascertain the origin of the different T c's. We find that the sample with the lowest T c has a lower hole concentration on the CuO 2 planes and the normal-state energy gaps are similar to those found in oxygen-depleted YBa 2Cu 3O 7−δ superconductors. Thus the electronic behaviour of Y 2Ba 4Cu 7O 15−δ is similar to that of YBa 2Cu 3O 7−δ and different T c values can be attributed to different hole concentrations on the CuO 2 planes and not to different pairing potentials or pair-breaking. The difference in the temperature dependence of the thermopower between these samples can be understood in terms of the different relative CuO chain and CuO 2 plane contributions.
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