RESISTIVITY AND THERMOELECTRIC-POWER OF YBA2CU3O7-DELTA PRBA2CU3O7-DELTA SUPERLATTICE WITH 2-UNIT-CELL-THICK YBA2CU3O7-DELTA LAYER IN ONE PERIOD/

Measurements of the resistivity and thermoelectric power (TEP) for a s eries of YBa2Cu3O7-delta/PrBa2Cu3O7-delta (YBCO/PrBCO) superlattice sa mples with 2-unit-cell-thick YBCO layer and 2, 4, 6 or 8-unit-cell-thi ck PrBCO layer in one period are reported. For the sample with 2-unit- cell-thick PrBCO layers, the resistivity of the YBCO layers is larger than that of bulk YBCO samples. The contribution of stoichiometric dif fusion and interface scattering is estimated. Its TEP is positive with positive temperature coefficient, different from the typical negative one in bulk YBCO samples with positive TEP values. The property of th e YBCO layers changes with increasing thickness of the PrBCO layers. F or the sample with 8-unit-cell-thick PrBCO layers, the contribution of the PrBCO layers has to be considered.