Thermoelectric power of ceramic Y-Ba-Cu-O with different content of oxygen under hydrostatic pressure up to 12 kbar

Temperature dependence of thermopower α and electrical conductivity σ of a YBa2Cu3Ox ceramics with x=6.4, 6.6 and 6.9 is studied in a 50-300 K temperature range under hydrostatic pressure up to 12 kbar. The thermopower is positive for each of the T, x and P values studied. For temperatures between 100 and 160 K, the curve α, the curve α(T) has a maximum. Pressure is found to affect the maximum in the same way as increase in oxygen content, namely: the maximum decreases in absolute value and shifts towards lower temperatures