Abstract
We report the superconducting properties of Aluminium (Al) wires deposited on different substrates. The substrates selected are the band insulator of SrTiO3 (STO) and the 2DEG system of LaAlO3/SrTiO3 (LAO/STO). Al wires were prepared from the respective films using focused ion beam assisted milling. A significant reduction in the superconducting transition temperature was observed with respect to a control Al film which was deposited on SiO2/Si substrate. The superconducting transition temperature of Al wire on STO substrate is 0.36 K, while that of LAO/STO substrate is 0.66 K. The temperature dependent critical current follows the classical Ginzburg-Landau formulation but with slightly varying exponent values compared to the value of 3/2 corresponding to a film in the clean limit.
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