A new buffer layer for high-quality HTSC ultrathin film fabrication
| Autor: | V. Borevich, L. Delimova, I. Liniichuk, A. Lyublinsky, M. Baydakova, V. Davydov, I. V. Grekhov |
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| Rok vydání: | 1997 |
| Předmět: |
Superconductivity
Materials science Fabrication Condensed matter physics Lattice (order) Energy Engineering and Power Technology Superconducting transition temperature Insulator (electricity) Dielectric Electrical and Electronic Engineering Condensed Matter Physics Buffer (optical fiber) Electronic Optical and Magnetic Materials |
| Zdroj: | ResearcherID |
| ISSN: | 0921-4534 |
| DOI: | 10.1016/s0921-4534(96)00704-6 |
| Popis: | A new structure of buffer layer for ultrathin YBCO film is offered. This structure represents a dielectric material composed of insulator grains and HTSC grains. The latter serve as perfect nuclei while ultrathin HTSC YBCO film is grown on this buffer layer. The absence of lattice mismatching between nuclei and an incipient film yield at the early stage of film growth a continuously connected structure that exhibits transport properties with full superconducting transition temperature higher than 80 K. As such a buffer layer we use Nb-doped YBCO material (YBCNO) composed of the elements (Y:Ba:Cu:Nb:O) in the proportion (1:2:3 − x : x :7), where x > 0.29. Using this buffer layer a 3-unit-cell-thick YBCO film with superconducting transition temperatures ΔT = 90−80 K and a metal-insulator-superconductor structure with a 4-unit-cell-thick YBCO film showing ΔT = 92−85 K were fabricated. To our knowledge this is the best result obtained so far. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
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