thereon as shown in fig2 it is understood that one unit cell of bi 2223 is in conformity with three unit cells of lasralo 4 extremely well it is also understood that the misfit of the lattice constants for the a axis length or b axis length and the c axis length are u2212 1 48 and 1 61 respectively which is extremely small therefore on a 110 lasralo 4 single crystal substrate a bi 2223 thin film whose c axis is oriented parallel to the substrate and whose a axis or b axis is oriented perpendicular to the substrate can be epitaxially grown however as shown in fig3 if a flat substrate is used nuclei are two dimensionally grown on the substrate and a large number of grains are formed making it difficult to obtain a continuous and flat film and worsening the superconducting property due to a weak coupling between grains moreover by a double temperature growth method only each grain is merely enlarged it still being difficult to obtain a continuous and even film and the superconducting properties are poor accordingly by using a vicinal substrate cut with a finite angle u03b8 from a 110 plane of a single crystal of lasralo 4 or lasrgao 4 or the like in the direction of 001 or a vicinal substrate cut with a finite angle u03b8 from a 10 10 plane a plane of a single.