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• W2030929712 abstract "The nucleation and early stages of growth, and the evolution of surface microstructure of epitaxial c-axis YBa2Cu3O7−x thin films are studied as a function of film thickness and growth temperature. The films were grown in situ on polished MgO (100) substrates by unbalanced DC magnetron sputtering at a growth rate of 3 nm/min. We use a combination of high-resolution scanning electron microscopy (SEM), scanning tunneling microscopy (STM), atomic force microscopy (AFM), X-ray diffraction, and transport-property measurements. The results from ultrathin films, 3 to 50 c⊥ unit cells (1 c⊥ unit cell equals 1.17 nm) indicate that epitaxial growth proceeds by the classical screw dislocation mediated three-dimensional island growth mode, i.e. each island grows both vertically and laterally by the incorporation of adatoms at a spirally expanding step emanating from one or more screw dislocations. The initial adatom clustering leads to a high density of nuclei (≈2×1011cm−2). The density of screw dislocations, ϱscrew, determined from STM images of the film surface, is found to depend on both the thickness of films and the growth temperature. At moderate growth temperatures (720–760°C) the early stage of coalescence of nuclei and island growth is characterised by a high density of screw dislocations, (3–9)×109cm−2, decreasing to (2–3)×109cm−2 for 200 c⊥ unit-cells films. Higher growth temperatures result in smooth films with a low density of screw dislocations, e.g.≤0.3×109cm−2 at 850°C for 200c⊥ unit-cells films. A correlation is found between high values of ϱscrew and high values of the critical current density. The ultrathin films exhibit suppression of superconductivity and broadening of the resistive transition with decreasing film thickness, so that Tc0=55 K for a 3 c⊥ unit-cells film." @default.
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• W2030929712 date "1994-06-01" @default.
• W2030929712 modified "2023-10-08" @default.
• W2030929712 title "Growth and evolution of microstructure of epitaxial YBa2Cu3O7−x ultrathin and thin films on MgO" @default.
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• W2030929712 doi "https://doi.org/10.1016/0921-4534(94)90473-1" @default.
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