| Project/Area Number |
22760031
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| Research Category |
Grant-in-Aid for Young Scientists (B)
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| Allocation Type | Single-year Grants |
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| Research Field |
Thin film/Surface and interfacial physical properties
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| Research Institution | Yonago National College of Technology |
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Principal Investigator |
TANAKA Hiromi 米子工業高等専門学校, 電気情報工学科, 准教授 (60511491)
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| Co-Investigator(Renkei-kenkyūsha) |
YOSHIKAWA Hideki 独立行政法人物質・材料研究機構, ナノ計測センター, 主幹研究員 (20354409)
KISHIDA Satoru 鳥取大学, 大学院・工学研究科, 教授 (30112105)
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| Project Period (FY) |
2010 – 2012
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| Project Status |
Completed (Fiscal Year 2012)
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| Budget Amount *help |
¥4,160,000 (Direct Cost: ¥3,200,000、Indirect Cost: ¥960,000)
Fiscal Year 2012: ¥910,000 (Direct Cost: ¥700,000、Indirect Cost: ¥210,000)
Fiscal Year 2011: ¥1,430,000 (Direct Cost: ¥1,100,000、Indirect Cost: ¥330,000)
Fiscal Year 2010: ¥1,820,000 (Direct Cost: ¥1,400,000、Indirect Cost: ¥420,000)
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| Keywords | 電子 / 電気材料 / 電子・電気材料 / 解析・評価 / 超伝導材料・素子 / 電子顕微鏡 |
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| Research Abstract |
Sr2+ sites by an Al2O3-seeded glassy quenched platelet method. We found that Bi-based superconducting whiskers whose Sr2+ sites of 25% were occupied by Ca2+ ions showed a high critical current densityJc in the order of 105A/cm2.We clarified chemical bond nature of as-grown Bi-based superconducting whiskers by X-ray photoemission spectroscopy XPS. Therefore, we confirmed that Ca2+ ions actually occupied Sr2+ sites by existence of another XPS peak at higher binding energy of each Ca-2p3/2,1/2 XPS spectrum.To clarify an origin of the Jc enhancement, we observed local structures of Bi-based superconducting whiskers by high-resolution transmission electron microscopy. Therefore, we found that strains which were come from a smaller ion radius of Ca2+ ion compared with one of Sr2+ ion. The strains affected a lattice mismatch between CuO2 plane and SrO plane in Bi-based superconductor and they forced to change modulation lengths in some unit cells. These strains seem to have worked seffective pinning centers in Bi-based superconducting whiskers.
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