Thermopower and resistivity in the normal state of mercury cuprate HTSCs under pressure

Nonmonotonic temperature dependence of the thermopower and resistivity of the multilayer mercury cuprate HgBa2Ca4Cu5O12 are observed in the temperature range 77–300 K under hydrostatic pressures of up to 10 kbar. The data obtained agree qualitatively with our results for HgBa2Ca2Cu3O8 [V. F. Kraidenov et al., Fiz. Nizk. Temp. 16, 1016 (1990), 20, 76 (1994), 19, 835 (1993) [Sov. J. Low Temp. Phys. 16, 593 (1990), 20, 64 (1994), 19, 597 (1993)]]. Experiments are carried out to check the applicability of the new “correlated polaron” model to the description of the normal state of HTSCs. It is shown that the model proposed by J. B. Goodenough and J. S. Zhou [Phys. Rev. B 49, 4251 (1994), 51, 3104 (1995)] is suitable for use as a working hypothesis for describing research on the temperature dependence of the thermopower, including its behavior under pressure.