Superconducting element having an intermediate layer with multiple fluorite blocks

A superconducting element, comprising:

• a lower superconducting layer comprising a first layered copper oxide compound, wherein said first layered copper oxide compound has a composition of (Pb.sub.2 Cu) Sr.sub.2 (Ca,RE).sub.n-1 Cu.sub.n O.sub.z,
• an intermediate layer superposed on said lower superconducting layer and comprising a second layered copper oxide compound, wherein said second layered copper oxide has a composition of (Pb.sub.2 Cu)AE.sub.2 {(RE1.sub.1-y RE2.sub.y)O.sub.2 }.sub.m+1 Cu.sub.2 O.sub.z, and
• an upper superconducting layer comprising a third layered copper oxide compound, wherein said third layered copper oxide compound has a composition of (Pb.sub.2 Cu)Sr.sub.2 (Ca,RE).sub.n-1 Cu.sub.n O.sub.z,
• wherein AE is at least one element selected from alkali earth elements, RE is an rare earth element, RE1 is at least one element from the group consisting of lanthanide elements and actinoid elements which form ions of valency of more than 3, RE2 is at least one element from the group consisting of yttrium and lanthanide elements which form ions of valency of 3, y is a number satisfying 0.ltoreq.y<1, n is a number from 1 to 4, m is a number satisfying 2.ltoreq.m.ltoreq.100, and z is an is an oxygen content.

A superconducting element comprising:

• a lower superconducting layer comprising a first layered copper oxide compound, wherein said first layered copper oxide compound has a composition of Tl.sub.2 Ba.sub.2 Ca.sub.n-1 Cu.sub.n O.sub.z,
• an intermediate layer superposed on said lower superconducting layer and comprising a second layered copper oxide compound, wherein said second layered copper oxide has a composition of Tl.sub.2 Ba.sub.2 {(RE1.sub.1-y RE2.sub.y)O.sub.2 }.sub.m+1 Cu.sub.2 O.sub.z, and
• an upper superconducting layer comprising a third layered copper oxide compound, wherein said third layered copper oxide compound has a composition of Tl.sub.2 Ba.sub.2 Ca.sub.n-1 Cu.sub.n O.sub.z,
• wherein AE is at least one element selected from alkali earth elements, RE1 is at least one element from the group consisting of lanthanide elements and actinoid elements which form ions of valency of more than 3, RE2 is at least one element from the group consisting of yttrium and lanthanide elements which form ions of valency of 3, y is a number satisfying 0.ltoreq.y<1, n is a number from 1 to 4, m is a number. satisfying 2.ltoreq.m.ltoreq.100, and z is an oxygen content.

A superconducting element, comprising,

• a lower superconducting layer comprising a first layered copper oxide compound wherein said first layered copper oxide compound has a composition of Tl.sub.2 Ba.sub.2 Ca.sub.n-1 Cu.sub.n O.sub.z ;
• an intermediate layer superposed on said lower superconducting layer and comprising a second layered copper oxide compound, wherein said second layered copper oxide has a composition of TlAE.sub.2 {(RE1.sub.1-y RE2.sub.y)O.sub.2 }.sub.m+1 Cu.sub.2 O.sub.z ;
• and
• an upper superconducting layer comprising a third layered copper oxide compound, wherein said third layered superconducting copper oxide compound has a composition of TlBa.sub.2 Ca.sub.n-1 Cu.sub.n O.sub.z, wherein AE is at least one element selected from alkali earth elements. RE1 is at least one element from the group consisting of lanthanide elements and actinoid elements which form ions of valency of more than 3, RE2 is at least one element from the group consisting of yttrium and lanthanide elements which form ions of valency of 3, y is a number satisfying 0.ltoreq.y<1, n is a number from 1 to 4, m is a number satisfying 2.ltoreq.m.ltoreq.100, and z is an oxygen content.

A superconducting element, comprising:

• a lower superconducting layer comprising a first layered copper oxide compound, wherein said first layered superconducting copper oxide compound has a composition of RE.sub.2 Ba.sub.2 Cu.sub.3 O.sub.7-.delta. ;
• an intermediate layer superposed on said lower superconducting layer and comprising a second layered copper oxide compound, wherein said second layered copper oxide has a composition of CuAE.sub.2 {(RE1.sub.1-y RE2.sub.y)O.sub.2 }.sub.m+1 Cu.sub.2 O.sub.z ;
• and
• an upper superconducting layer comprising a third layered copper oxide compound, wherein said third layered copper oxide compound has a composition of RE.sub.2 Ba.sub.2 Cu.sub.3 O.sub.7-.delta.,
• wherein AE is at least one element selected from alkali earth elements, RE is a rare earth element, RE1 is at least one element from the group consisting of lanthanide elements and actinoid elements which form ions of valency of more than 3, RE2 is at least one element from the group consisting of yttrium and lanthanide elements which form ions of valency of 3, y is a number satisfying 0.ltoreq.y.ltoreq.1, n is a number from 1 to 4, m is a number satisfying 2.ltoreq.m<100, z is an oxygen content, and .delta. is an oxygen deficiency.

A superconducting element comprising:

• a lower superconducting layer comprising a first layered copper oxide compound, said first layered copper oxide compound being superconducting;
• an intermediate layer superposed on said lower superconducting layer and comprising second layered copper oxide compound having a crystal structure which includes a multiple block having the crystal structure of fluorite in a part of said crystal structure, said second layered copper oxide compound having a composition represented by the chemical formula of {B}AE.sub.2 {(RE1.sub.1-y RE2.sub.y)O.sub.2 }.sub.m+1 Cu.sub.2 O.sub.z ;
• and
• an upper superconducting layer superposed on said intermediate layer and comprising a third layered copper oxide compound, said a third layered copper oxide compound being superconducting,
• wherein {B} is at least one member selected from the group consisting of {Bi.sub.2 O.sub.2 }.sup.2+, {Tl.sub.2 O.sub.2 }.sup.2+, {TlO}.sup.1+, {PbO-Cu-PbO}.sup.1+, {(Pb,Cu)O}.sup.1+, and CuO.sub..delta. chain, AE is an alkali earth element, RE1 is at least one element selected from the group consisting of lanthanide elements and actinoid elements which form ions of valency of more than 3, RE2 is at least one element from the group consisting of yttrium and lanthanide elements which form ions of valency of 3, y is a number satisfying 0.ltoreq.y.ltoreq.1, m is a number satisfying 2.ltoreq.m<100, z is an oxygen content, and .delta. is an oxygen amount, and wherein said multiple block layer having the crystal structure of fluorite has a composition represented by the chemical formula of {(RE1.sub.1-y RE2.sub.y)O.sub.2 }.sub.m+1, in which a layer of cations of RE1 or RE2 and a layer of O.sup.2- anions are alternately stacked, and said multiple block layer is interposed between CuO.sub.2 planes.

A superconducting element, comprising:

• a lower superconducting layer comprising a first layered copper oxide compound having a composition represented by the chemical formula of Bi.sub.2 Sr.sub.2 Ca.sub.n-1 Cu.sub.n O.sub.z, where n=1 to 4, and z is an oxygen content;
• an intermediate layer superposed on said lower superconducting layer and comprising second layered copper oxide compound having a composition represented by the chemical formula of Bi.sub.2 Sr.sub.2 {(RE1.sub.1-y RE2.sub.y)O.sub.2 }.sub.m+1 Cu.sub.n O.sub.z, wherein RE1 is at least one element from the group consisting of yttrium and lanthanide elements which form ions of valency of more than 3, RE2 is at least one element selected from the group consisting of yttrium, lanthanide elements, and actinoid elements which form ions of valency of 3, y is a number satisfying 0.ltoreq.y<1, m is a number satisfying 2.ltoreq.m.ltoreq.100, and z is an oxygen content, and the part represented by {(RE1.sub.1-y RE2.sub.y)O.sub.2 }.sub.m+1 in the chemical formula has a crystal structure of fluorite in which a layer of cations of RE1 or RE2 and a layer of O.sup.2- anions are alternately stacked;
• and
• an upper superconducting layer superposed on said intermediate layer and comprising a third layered copper oxide compound having a composition represented by the chemical formula of Bi.sub.2 Sr.sub.2 Ca.sub.n-1 Cu.sub.n O.sub.z, where n=1 to 4, and z is an oxygen content.