Two-Dimensional Behavior of YBa2Cu3Ox Films on SrTiO3 Substrates |
| P.N. Mikheenko Centre for Superconducting and Electronic Materials, University of Wollongong, Wollongong 2522, Australia and S.J. Lewandowski Instytut Fizyki, Polish Academy of Sciences, Αl. Lotników 32/46, 02-668 Warszawa, Poland |
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| Long-term (up to 18 months) degradation of textured YBa2Cu3Ox films prepared by laser ablation and magnetron sputtering on single crystal SrΤiO3, MgO and Al2O3 substrates were investigated. All films at each stage of exposition displayed a clearly visible quasi-2D behavior. From the measurements of the Kosterlitz-Thouless temperature it could be concluded that the oxygen content and density of charge carriers remained constant. It follows that the main consequence of degradation is the omission of some planes from the transport of supercurrent and the samples could be described in the model of layered structure with variable number of conducting planes. Using this model we find that effective thickness of an isolated CuO2 plane in samples with greatest internal damage is ≈2Å. |
| DOI: 10.12693/APhysPolA.92.152 PACS numbers: 74.80.-g, 74.80.Dm, 74.76.-w, 74.62.Dh |