engleski

Thermoelectric power in Bi2Sr2Ca1-xPrxCu2O8+delta in a wide temperature range

We report thermopower and electrical resistance measurements of the high-temperature superconductor Bi2Sr2Ca1-xPrxCu2O8+δ in a wide temperature range from 600 K to superconducting transition temperature (critical temperature, Tc). The transition temperature decreases with increasing x. Resistance obeys usual metallic linearity at higher temperatures, whereas at lower temperatures, before Tc (T~300 K), a deviation from the linear trend is observed. Thermopower exhibits apparently non-metallic behavior, it increases with decreasing temperature and develops a broad maximum whose position and width increase with x. The results are discussed in the framework of several models present in the literature.

thermopower; resistance; high-temperature superconductivity; cuprates

Rad je prikazan na 12. susretu vakuumista Hrvatske i Slovenije, 18.05.2005.