A direct correlation between Tc and EDOS for 1-2-3 type (Ca0.1La0.9)(Ba1.65La0.35)Cu3Oy superconductor
| Autor: | Marcin Matusiak, C. Sułkowski, Tomasz Plackowski |
|---|---|
| Rok vydání: | 2003 |
| Předmět: |
Superconductivity
Materials science Condensed matter physics Transition temperature Fermi level Analytical chemistry Energy Engineering and Power Technology Fermi surface Condensed Matter Physics Electronic Optical and Magnetic Materials symbols.namesake Electrical resistivity and conductivity Seebeck coefficient Density of states symbols Electrical and Electronic Engineering Type-II superconductor |
| Zdroj: | Physica C: Superconductivity. 387:183-186 |
| ISSN: | 0921-4534 |
| DOI: | 10.1016/s0921-4534(03)00666-x |
| Popis: | We have prepared a series of (Ca 0.1 La 0.9 )(Ba 1.65 La 0.35 )Cu 3 O y ceramic samples where y varies from 6.75 to 7.23 by annealing in oxygen at various pressures (up to 1330 bar). This compound (called CLBLCO) is one of few high- T c superconductors for which the oxygen content can be varied throughout the entire doping range. In our series the critical temperature increases from T c =16.9 K for y =7.00 (underdoped region) (the sample with y =6.75 is non-superconducting) to T c =30.1 K for y =7.10 (optimal doping). With further increase of the oxygen content T c decreases to 8.8 K for y =7.23 (overdoped region). Here, we present measurements of the resistivity ( ρ ), thermoelectric power ( S ), the Hall coefficient ( R H ), and their interpretation in terms of a simple metal theory. In this approach we indicate a correlation between the transition temperature ( T c ) and the density of the electronic states (EDOS) at the Fermi surface ( g ( E F )). |
| Databáze: | OpenAIRE |
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