2014 Fiscal Year Final Research Report
Study of interlayer tunneling spectroscopy on the pseudogap phase in cuprate superconductors
| Project/Area Number |
24560017
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| Research Category |
Grant-in-Aid for Scientific Research (C)
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| Allocation Type | Multi-year Fund |
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| Section | 一般 |
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| Research Field |
Applied materials science/Crystal engineering
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| Research Institution | Aoyama Gakuin University |
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Principal Investigator |
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| Project Period (FY) |
2012-04-01 – 2015-03-31
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| Keywords | 高温超伝導 / 固有ジョセフソン接合 / トンネルスペクトロスコピー / 自己発熱効果 / 擬ギャップ / 超伝導ギャップ / 集束イオンビーム |
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| Outline of Final Research Achievements |
The pseudogap state in cuprate superconductors has been attracted, since it is an unusual elctronic phase characterizing the complex phase diagram in them. In this study, we measured the interlayer tunneling spectra for small intrinsic Josephson junctions (IJJs) fabricated from crystalline cuprate superconductors by using focused ion beam (FIB) techniques, and tried to observe the pseudogap in the differential conductance spectra and to reduce the self-heatings giving serious influences to the measured spectra. We succeeded in fabricating small IJJs with lateral area of 1 micrometer squared and a small number of juctions less than 10, by using only FIB techniques, and in observing a clear signature of the pseudogap in the measured spectra. We also obtained a prospect on a short pulse method, which can more effectively reduce the self-heatings to obtain more precise spectra.
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| Free Research Field |
物性物理、特に超伝導の基礎と応用
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