Laser ablated bismuth cuprate thin films preparation and effect of oxygen nonstoichiometry upon superconductivity
| Autor: | G. Poullain, J.F. Hamet, H. Murray, Thierry Brousse, B. Raveau |
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| Rok vydání: | 1990 |
| Předmět: |
Superconductivity
Laser ablation Materials science Annealing (metallurgy) Analytical chemistry Energy Engineering and Power Technology chemistry.chemical_element Condensed Matter Physics Oxygen Electronic Optical and Magnetic Materials Bismuth Monocrystalline silicon chemistry Cuprate Electrical and Electronic Engineering Thin film |
| Zdroj: | Physica C: Superconductivity. 170:545-551 |
| ISSN: | 0921-4534 |
| DOI: | 10.1016/0921-4534(90)90027-c |
| Popis: | Thin films of Bi 2 Sr 2 CaCu 2 O 8 and (Bi, Pb) 2 Sr 2 Ca 2 Cu 3 O 10 have been prepared on monocrystalline (100) MgO substrates, using a laser ablation method with post annealing treatment. The influence of substrate temperature and oxygen pressure during deposition were investigated. SEM observations, EDS analysis, electric and magnetic measurements have been used to characterize the films. Superconducting “2212” films, with T c ( R = 0) at 80–83 K and J c (50 K) up to 5 × 10 5 A/cm 2 , have been currently achieved, while Pb-doped “2223” films exhibit T c as high as 110 K with J c = 5 × 10 4 A/cm 2 at 77 K. The effect of annealing at low temperature (350°C) in an argon flow has been studied for the 2212 phase, it shows the influence of the oxygen non-stoichiometry, i.e. of the hole carrier density upon T c 's which can be measured up to 89 K (zero resistance). |
| Databáze: | OpenAIRE |
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