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Analysis of the surface termination of Nd1+xBa2-xCu3Oy thin films (Articolo in rivista)

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Analysis of the surface termination of Nd1+xBa2-xCu3Oy thin films (Articolo in rivista) (literal)

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Torrelles, X; Aruta, C; Fragneto, A; Maggio-Aprile, I; Ortega, L; Ricci, F; Rius, J; Salluzzo, M; di Uccio, US (2004)
Analysis of the surface termination of Nd1+xBa2-xCu3Oy thin films
in Physical review. B, Condensed matter and materials physics; APS, American physical society, College Park, MD (Stati Uniti d'America)
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Torrelles, X; Aruta, C; Fragneto, A; Maggio-Aprile, I; Ortega, L; Ricci, F; Rius, J; Salluzzo, M; di Uccio, US (literal)

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1. Univ Naples Federico 2, INFM COHERENTIA, I-80125 Naples, Italy 2. Univ Naples Federico 2, Dipartimento Sci Fis, I-80125 Naples, Italy 3. CSIC, Inst Ciencia Mat Barcelona, E-08193 Barcelona, Spain 4. Univ Roma Tor Vergata, INFM COHERENTIA, Dipartimento Ingn Meccan, I-00133 Rome, Italy 5. Univ Geneva, Dept Phys Mat Condensee, CH-1211 Geneva, Switzerland 6. CNRS, Cristallog Lab, F-38042 Grenoble, France 7. Univ Cassino, DiMSAT, I-03043 Cassino, Italy (literal)

Titolo

Abstract

High quality, very flat Nd1+xBa2-xCu3Oy films have been grown by sputtering and analyzed by low energy electron diffraction, scanning tunneling microscopy (STM) and grazing incidence x-ray diffraction (GIXD) employing synchrotron radiation, in order to investigate the surface structure and morphology. The refinement of the GIXD data has been performed on the basis of structural models sensitive to the nature of the terminating layer. The interpretation of the results provides a picture of the surface structure that is in full agreement with STM results. The surface is composed by two terraces with different termination, one of which is an ordered and complete Cu(1)-O layer and the other an incomplete BaO layer that partially covers a disordered Cu(1)-O layer. Atomic vacancies and steps bounding terraces with a height of about 0.4 nm, are present on the surface. (literal)

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