Superconducting ceramic circuits and manufacturing method for the same

Claim 2

A multilayered superconducting circuit comprising: a lower superconducting pattern made of a super­conducting ceramic material; an intervening insulating ceramic film formed on said lower superconducting pattern; and an upper superconducting pattern made of a superconducting ceramic material insulated from said lower superconducting pattern by said insulating ceramic film.

Claim 3

The circuit of claim 1 wherein said lower and upper superconducting patterns are interconnected through an opening formed in said insulating ceramic film.

Claim 4

The curcuit of claim 1 wherein said lower and/or upper superconducting pattern is a coil.

Claim 5

The curcuit of claim 3 wherein said lower and upper patterns are coils of opposite senses and coupled in order to a multilayered coil.

Claim 6

The circuit of claim 1 wherein said lower pattern is formed on an insulating ceramic substrate.

Claim 7

The circuit of claim 1 wherein said patterns are spirals formed on a disk.

Claim 8

The circuit of claim 1 wherein said patterns are helices on a cylindrical surface.

Claim 9

The circuit of claim 1 wherein said insulating ceramic film is made of an oxide ceramic material conforming to the stoichiometric formula [(A′ p A˝ 1-­p ) 1-x (B′ q B˝ 1-q ) x ] y (Cu r X 1-r ) z O w , where A′ is one or more elements of Group IIIa of the Priodic Table, e.g., the rare earth elements of lantanoides, B′ is one or more alkaline earth metals, i.e. Ba, Sr and Ca, A˝, B˝ and X are selected from a group consisting of Mg, Be, Al, Fe, Co, Ni, Cr, Ti, Mn and Zr, and 0<x<1; y = 2.0 - 4.0; z = 1.0 - 4.0; and w = 4.0 - 10.0, and the numbers p, q and r are chosen so that the total proportion of A˝, B˝ and X is 1-20 vol%, and wherein said superconducting ceramic pattern is made of materials conforming to the stoichiometric formula, (A 1-x B x ) y Cu z O w , where A is one or more ele­ments of Group IIIa of the Priodic Table, e.g., the rare earth elements or lantanoides, B is one or more alkaline earth metals, i.e. Ba, Sr and Ca, and 0<x < 1; y = 2.0 - 4.0; z = 1.0 - 4.0; and w = 4.0 - 10.0.

Claim 12

The method of claim 9 wherein the oxide ceramic material of said insulating coating is selected from materials having a thermal expansion coefficient approximately equal to that of said superconducting patterns.

Claim 13

The method of claim 9 wherein said first super­conducting pattern is formed on a ceramic surface.

Claim 14

The method of claim 9 wherein said first super­conducting pattern is formed on a disk in spiral form.

Claim 15

The method of claim 12 wherein said second superconducting pattern is a spiral in the opposite sense to that of said first superconducting pattern.

Claim 16

The method of claim 13 wherein said first and second superconducting patterns are interconnected to constitute a triple-layered coil.

Claim 17

The method of claim 14 wherein said first super­conducting pattern is formed on a cylinder in helical form.

Claim 18

The method of claim 14 wherein said second superconducting pattern is a helix in the opposite sense to that of said first supercoducting pattern.

Claim 19

The method of claim 16 wherein said first and second superconducting patterns are interconnected to constitute a triple-layered coil.

Claim 20

In a method of manufacturing superconducting circuits, the steps of: providing a temporary substrate of a material which is soluble to a suitable solvent; covering the surface of said substrate with an insulating ceramic film; forming a superconducting ceramic pattern on the surface of said insulating ceramic pattern; and removing said temporary substrate with said solvent.

Claim 21

In a method of manufacturing superconducting circuits, the steps of: providing a temporary substrate of a material which is soluble to a suitable solvent; covering the surface of said substrate with an insulating ceramic film; forming a superconducting ceramic pattern on the surface of said insulating ceramic pattern; and removing said temporary substrate with said solvent.