Correlations between transport coefficients and electronic structure for 1-2-3 (Ca0.1La0.9)(Ba1.65La0.35)Cu3Oysuperconductors
| Autor: | Marcin Matusiak, Tomasz Plackowski, C. Sułkowski |
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| Rok vydání: | 2004 |
| Předmět: |
Superconductivity
Materials science Condensed matter physics Transition temperature Fermi level Metals and Alloys Fermi surface Electronic structure Condensed Matter Physics symbols.namesake Electrical resistivity and conductivity Hall effect Seebeck coefficient Materials Chemistry Ceramics and Composites symbols Electrical and Electronic Engineering |
| Zdroj: | Superconductor Science and Technology. 17:596-600 |
| ISSN: | 1361-6668 0953-2048 |
| DOI: | 10.1088/0953-2048/17/4/005 |
| Popis: | Normal-state transport properties of (Ca0.1La0.9)(Ba1.65La0.35)Cu3Oy ceramic superconductors have been studied. The oxygen content (y) was varied from 6.75 to 7.23 by annealing in atmospheres of various oxygen partial pressures (up to 1330 bar). That way the concentration of mobile charge carriers was varied throughout the entire doping range. The most reduced sample in our series (y = 6.75) is non-superconducting. The first superconducting, underdoped sample (y = 7.00) has a critical temperature of Tc = 16.9 K. The Tc rises further to 30.1 K for y = 7.10 (optimal doping) and then continuously drops to 8.8 K for y = 7.23 (overdoped region). We present temperature dependences of the resistivity (ρ), thermoelectric power (S) and Hall coefficient (RH), and their interpretation in terms of a simple metal theory. We have found a correlation between the transition temperature (Tc) and the density of the electronic states (EDOS) at the Fermi surface (gEF). This result agrees with previous calculations and experiments. |
| Databáze: | OpenAIRE |
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