Untitled

Abstract

Nominal Y0.3B&.6Na0.1CuO~6 thin films were prepared with small grains having an orientation of the c axis perpendicular to the MgO substrate. The electrical resistivity and the thermoelectric power in the absence and in the presence of a magnetic field are reported. The magnetic field dependence of the irreversibility line is discussed. The role of the field for disentangling intragrain and intergrain effects in both coefficients is emphasized.

Simultaneous measurements of thermal diffusivity, thermal conductivity and thermopower with application to copper and ceramic superconductors

“…6). Notice that the data are comparable to those found in the literature respectively for the thermal conductivity [14,15], the thermopower [16,17], the thermal diffusivity [18], and the specific heat [19], but obviously those data were obtained under different conditions and nonsimultaneous runs. The electrical resistivity ρ(T ) is shown respectively for the same 99.9% pure Goodfellow Cu, Y 1−x Ca x Ba 2 Cu 3 O 7−δ (x = 0.1) and Dy 1 Ba 2 Cu 3 O 7−δ polycrystalline samples between 120 K and 40 K for further discussion.…”

Influence of Na doping and sintering temperature on increasing Bi2Sr2CaCu2O8 superconducting phase content in powder-form materials

“…As for YBCO materials [1,2], it is of great interest to study the effects of Na ion substitution in 2212 materials since, beside providing some information on the chemical and physical properties of the system, it might lead to an improvement of their technological properties, such as the superconducting critical temperature and the current carrying capacity.…”

Analysis of experimental conditions for simultaneous measurements of transport and magnetotransport coefficients of high temperature superconductors

“…This, in turn, permits to provide a more reliable interpretation, since, e.g., systematic errors are minimised and the behaviour of one coefficient may suggest what physical mechanisms are responsible for the behaviour of other ones. Furthermore the measurements can be put in parallel on the simultaneous ones of k, S and the thermal diffusion, as described in [1][2][3][4].…”