| US 7,491,678 B2 | ||
| Superconducting thin film having columnar pin retaining center using nano-dots | ||
| Ioan Adrian Crisan, Tsukuba (Japan); and Hideo Ihara, Tsukuba (Japan); Yoshiko Ihara, legal representative, Hideyo Ihara, legal representative, Hidetaka Ihara, legal representative, Gen-ei Ihara, legal representative, and Chiaki Ihara, legal representative | ||
| Assigned to Japan Science and Technology Agency, Saitama (Japan); and National Institute of Advanced Industrial Science and Technology, Tokyo (Japan) | ||
| Appl. No. 10/480,942 PCT Filed Jun. 17, 2002, PCT No. PCT/JP02/06007 § 371(c)(1), (2), (4) Date May 12, 2004, PCT Pub. No. WO02/103815, PCT Pub. Date Dec. 27, 2002. |
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| Claims priority of application No. 2001-185597 (JP), filed on Jun. 19, 2001. | ||
| Prior Publication US 2004/0235670 A1, Nov. 25, 2004 | ||
| Int. Cl. H01L 39/12 (2006.01); H01B 12/00 (2006.01); B05D 5/12 (2006.01) | ||
| U.S. Cl. 505—238 [505/237; 505/475; 427/62; 427/287] | 6 Claims |
| 1. A superconducting thin film structure having columnar pinning centers and comprising:
a substrate,
nano dots or nano stripes which are formed insularly on the substrate and three-dimensionally in shape, said nano dots or
nano stripes comprising a material selected from the group consisting of Ag, Mg and Zn,
amorphous or non-superconducting columnar defects composed of a superconducting material and grown on said nano dots or nano
stripes, respectively, and
a superconducting thin film composed of said superconducting material formed in those areas on said substrate which are other
than those where said columnar defects are formed;
wherein said substrate is a substrate of SrTiO3, MgO or Al2O3, or a substrate having a buffer layer of CeO2 formed thereon; and
said superconducting thin film is a superconducting thin film that can be expressed by composition formula: (Cu1−xTlx)Ba1−ySryCa2Cu3Oz where 0≤x≤1, 0≤y≤1, and 0<z.
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