Scaling of the thermoelectric power in a wide temperature range inBi2Sr2

Superconductivity in the extended hubbard model with more than nearest-neighbour contributions

“…The extension of the A 1 -symmetry domain becomes reduced and the d x 2 −y 2 phase boundary is withdrawn more accentuately with increasing temperature in the presence of NNN hoppings. All these theoretical results are perfectly compatible with and underline aspects observed in an increasing number of experimental data covering a large spectrum and suggesting the importance of NNN hopping contributions in building up superconducting properties: inelastic neutron scattering (Bourges, Regnault, Sidis and Vettier, 1996), magneto-resistance and conductivity (Mashimoto, Nakao, Kado and Koshizuka, 1996), thermopower, resistivity (Gasumyants, Ageev, Vladimirskaya, Smirnov, Kazanskiy and Kaydanov, 1996), and Hall effect (Hopfengartner, Leghissa, Kreiselmeyer, Holzapfel, Schmitt and Ischenko, 1993) measurements. Theoretical support of this line (Cappelluti et al, Normand, H. Kohno and H. Fukuyama, 1996) is also present (see also the Introduction).…”

Mechanism of a strong rise of T due to the calcium doping in Y1−Ca Ba2Cu2.8Zn0.2O

“…Within this approach one can study the band spectrum transformation depending on the type and content of different impurities. This was repeatedly demonstrated in our previous publications devoted to Y-, La-, Hg-and Bi-based HTSC's [5][6][7][8]18,[21][22][23][24][25][26], as well as by other authors used our model for analyzing their experimental data [27][28][29][30][31][32][33][34].…”

Thermopower of high-Tccuprates

“…Several authors have tried to explain S of HTSC in terms of phonon drag. Early arguments, however, had some difficulty in explaining the unusual linear T-dependence of S which persists up to 600 K [20,21]. Recently Trodahl [22] has shown that inclusion of phonon drag and a cylindrical Fermi-surface can explain the unusual T-dependence within a conventional Fermi-liquid theory.…”