NORMAL-STATE THERMOELECTRIC-POWER OF VANADIUM-SUBSTITUTED (BI0.8PB0.2-YVY)2SR2CA2CU3OX SUPERCONDUCTING PELLETS

The temperature dependence of vanadium-substituted (Bi0.8Pb0.2-yVy)2Sr 2Ca2Cu3O(x) samples with 0<y<0.075 is reported between T(co) and 300 K . Thermoelectric power of all the samples was found to be positive and to increase approximately linearly with decrease of temperature up to about 120 K, before falling to zero at T(co). The measured data have been analysed on the basis of three relevant theoretical models and fr om which we conclude that the temperature variation of TEP of pure and vanadium-substituted (Bi-Pb) cuprates could be explained extremely we ll (within 1%) according to the expression proposed by Forro et al. us ing a modified two-band model.