2012 Fiscal Year Final Research Report
Study on spin-triplet high-temperature superconducting cooper pairs
| Project/Area Number |
23656214
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| Research Category |
Grant-in-Aid for Challenging Exploratory Research
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| Allocation Type | Multi-year Fund |
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| Research Field |
Electronic materials/Electric materials
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| Research Institution | Nagoya University |
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Principal Investigator |
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| Co-Investigator(Kenkyū-buntansha) |
UEDA Kenji 名古屋大学, 大学院・工学研究科, 准教授 (10393737)
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| Project Period (FY) |
2011 – 2012
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| Keywords | 超伝導 / スピン三重項 |
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| Research Abstract |
To realize peculiar spin-triplet high-temperature superconducting states, we have investigated preparation and electrical properties of hetero-junctions with spin-singlet oxide, or nitride superconductors and magnetic materials.Infinite-layer oxide superconducting Sr0.9La0.1CuO2 can be successfully obtained in a-axis oriented thin films, which are favorable for the control of the junction interfaces owing to their long superconducting coherence length. Hetero epitaxial growth between a-axis superconducting Sr0.9La0.1CuO2 films and ferromagnetic Sr2CrReO6 or antiferromagnetic SrLaVMoO6 films was also achieved.The effect of insertion of ultra-thin magnetic layers in NbN superconducting junctions was examined. The junctions with a 1 nm-thick ferromagnetic CoFe insertion layer exhibited asymmetric Fraunhofer patterns with a minimum of Josephson supercurrent at zero field, which suggests the possibility of existence of spin-triplet cooper pairs due to magnetic inhomogeneity of junction interfaces.
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