JP2842281B

A flux transformer comprises a pickup coil 1, an input coil 2 and a pair of lines 3, 4. The line 4 contains a bridge part 4a intersecting the input coil 2. The pickup coil 1, input coil 2 and a pair of lines 3, 4 are formed of a first and a second oxide superconducting thin films 11, 12. Furthermore, the flux transformer comprises a non-superconducting thin film 13. The non-superconducting thin film 13 is disposed between the first and the second oxide superconducting thin films 11, 12 and is located in a domain where the line 4 intersects the input coil 2. A pattern of the first oxide superconducting thin film 11 corresponds to the pickup coil 1, the input coil 2 and the lines 3, 4 except the bridge part 4a. The pattern of the second oxide superconducting thin film 12 corresponds to the input coil 2 except the domain where the non-superconducting thin film exists, the pickup coil 1 and the lines 3, 4. Except in the domain where the non-superconducting thin film 13 exists, the second oxide superconducting thin film 12 are piled up directly atop the first oxide superconducting thin film 11 in all domains.