High temperature superconductor, in particular improved coated conductor
A coated conductor is provided with improved electrical connection between the conductive layers such as the high temperature superconductor layer and a metal protection layer applied onto the high temperature superconductor layer and the substrate. A method includes obtaining such electrical connection, in particular, creating a coated conductor wherein the substrate is a core covered with the layers all around its periphery.
1. Coated conductor, comprising:
a metal substrate; and
a layer structure, wherein the layer structure is made of:
at least one buffer layer, and
a high temperature superconductor layer; and
wherein, within the layer structure, at least one conductive path is provided for electrically connecting the conductive layers of the layer structure with the metal substrate, wherein the conductive path is formed by at least one through-hole extending through the at least one buffer layer to the substrate,
wherein the at least one through-hole does not extend through the high temperature superconductor layer, and
wherein the high temperature superconductor layer, provided onto the upper most buffer layer is in electrical contact with the substrate via the at least one through-hole.
2. Coated conductor according to claim 1 , wherein the at least one through-hole is filled with a conductive metal.
3. Coated conductor according to claim 1 , wherein the coated conductor has a tape shape.
4. Coated conductor according to claim 1 , wherein the coated conductor is composed of a core which is surrounded by the layer structure.
5. Coated conductor according to claim 4 , wherein the shape of the cross-sectional area of the core is selected from the group consisting of a round, oval and polygonal shape.
6. Coated conductor according to claim 1 , wherein the high temperature superconductor is selected from the group consisting of Bi—Ae—Cu—O, (Bi, Pb)—Ae—Cu—O y , Re—Ae—Cu—O, (Tl, Ph)—Ae—Cu—O, Hg—Ae—Cu—O y or MgB 2 , wherein y represents the relative oxygen content, Ac is at least one alkaline earth element, and Re is at least one rare earth element.
7. Coated conductor according to claim 6 , wherein the high temperature superconductor is YBCO-123.
8. Coated conductor according to claim 1 , wherein onto the surface of the substrate on the bottom of the at least one through-hole an electrically conductive material is applied for forming a conducting area onto the surface of the substrate.
9. Coated conductor according to claim 8 , wherein the conductive material is selected from silver, platinum, gold and silver alloy.
10. Coated conductor according to claim 8 , wherein the layer structure further includes a metal protection layer.