Thermoelectric power of (Cu_0.5Tl_0.5)-1223 superconducting phase added with BaSnO3 nanoparticles

Abstract

In this study, we report the thermoelectric power (TEP) measurements of Cu 0.5 Tl 0.5 Ba 2 Ca 2 Cu 3 O 10-δ added with BaSnO 3 nanoparticles. BaSnO 3 nanoparticles were prepared by chemical co-precipitation method, while (BaSnO 3) x /(CuT1)-1223 superconducting samples with 0.00 ≤ x ≤ 1.50 wt% were prepared using the solid-state reaction method. The standard four-probe technique was applied to measure DC electrical resistivity in the temperature range from 300 to 77 K. Superconducting transition temperature (T c) increases up to 117.5 for x = 0.25 wt.% and then it decreases with further x addition. The TEP coefficient was measured as a function of temperature in a wide temperature range from ~77 K (liquid nitrogen temperature) up to 280 K using a standard differential technique. The behavior of the obtained TEP coefficient is suit with high-T c copper-oxide superconductors. The results were investigated according to two-band model with an extra linear term. Several parameters such as the pseudo-gap temperature (T*), Fermi energy (E F) and Fermi temperature (T F) values were calculated and discussed in terms of nanoparticles BaSnO 3 addition.

Effects of Thallium fluoride substitution on the flux pinning energies of (Cu0.5, Tl0.5)Ba2Ca2Cu3O10-δ superconductors

“…The superconducting properties of the (Cu, Tl)-1223 system are dependent on the hole concentration or the number of holes per Cu-atom [36,37]. A parabolic relationship [38] holds between the superconducting transition temperature and the hole concentration as indicated in the following equation:…”