Thickness effect on the structure and superconductivity of Nd1.2Ba1.8Cu3O7+x epitaxial films
| Autor: | G. M. De Luca, Matteo Tropeano, Marco Salluzzo, Ruggero Vaglio, Marina Putti, U. Scotti di Uccio, Daniele Marré |
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| Přispěvatelé: | Salluzzo, M., De Luca, G. M., Marre’, D., Putti, M., Tropeano, M., SCOTTI DI UCCIO, Umberto, Vaglio, Ruggero, de Luca, G. M., Marre, D. |
| Rok vydání: | 2007 |
| Předmět: |
Superconductivity
STRAIN Materials science Condensed matter physics business.industry Thin films Energy Engineering and Power Technology Bragg's law Sputter deposition Condensed Matter Physics Electronic Optical and Magnetic Materials Optics Sputtering High critical temperature superconductors Phase (matter) Strain effect CRITICAL-TEMPERATURE Orthorhombic crystal system Electrical and Electronic Engineering Thin film business Crystal twinning |
| Zdroj: | Physica. C, Superconductivity 460 (2007): 724–725. doi:10.1016/j.physc.2007.03.360 info:cnr-pdr/source/autori:Salluzzo M.; de Luca G.M.; Marre D.; Putti M.; Tropeano M.; di Uccio U.S.; Vaglio R./titolo:Thickness effect on the structure and superconductivity of Nd1.2Ba1.8Cu3O7+x epitaxial films/doi:10.1016%2Fj.physc.2007.03.360/rivista:Physica. C, Superconductivity (Print)/anno:2007/pagina_da:724/pagina_a:725/intervallo_pagine:724–725/volume:460 |
| ISSN: | 0921-4534 |
| DOI: | 10.1016/j.physc.2007.03.360 |
| Popis: | We have studied the effect of thickness on the structure and superconductivity of Nd1.2Ba1.8Cu3O7+x (NdBCO) epitaxial films deposited on SrTiO3 (100) substrates. High quality NdBCO films were deposited by high oxygen pressure sputtering. The samples have been carefully characterized by transport measurements and X-ray diffraction using conventional and synchrotron radiation sources. Two structural transformations are observed. The first one is a crossover from the orthorhombic and twinned structure, typical of thick samples, to a pseudotetragonal phase at thickness lower than 60 unit cells. The pseudotetragonal phase exhibits peculiar X-ray diffuse scattering around the Bragg reflections, associated to nanostructured twinned domains. The second one appears at thickness lower than 20 unit cells and is assigned to a pseudotetragonal-tetragonal transition. The transport properties are not modified at the first crossover, while a substantial decrease of T-c and of the number of holes is observed at the pseudotetragonal-tetragonal transformation. Our results suggest that the structural rearrangement and the transport properties are explained by the ordering of Cu(I)O chains. (c) 2007 Elsevier B.V. All rights reserved. |
| Databáze: | OpenAIRE |
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