Normal state thermopower of the high temperature superconductor YBa2Cu3O6.5+λ

The behaviour of the thermopower between 50 and 350 K has been determined for YBa2Cu3O6.5+λ. A zero value of the thermopower below 90.6 K and a flat maximum of 5.52 μV K−1 at about 100 K have been found. The thermopower shows metal like behaviour. Carrier concentration 2.4 × 1021 cm−3 and carrier mobility 2.5 cm2 V−1 s−1 at ambient temperature were determined.