10 GPa high pressure NMR study of Fe based high temperature superconductor
| Project/Area Number |
21540351
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| Research Category |
Grant-in-Aid for Scientific Research (C)
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| Allocation Type | Single-year Grants |
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| Section | 一般 |
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| Research Field |
Condensed matter physics II
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| Research Institution | Chiba University |
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Principal Investigator |
KOBORI Yoh 千葉大学, 大学院・理学研究科, 教授 (10153660)
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| Co-Investigator(Kenkyū-buntansha) |
FUKAZAWA Hideto 千葉大学, 大学院・理学研究科, 准教授 (90361443)
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| Co-Investigator(Renkei-kenkyūsha) |
TAKESHITA Nao 産業技術総合研究所, 主任研究員 (60292760)
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| Project Period (FY) |
2009 – 2011
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| Project Status |
Completed (Fiscal Year 2011)
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| Budget Amount *help |
¥4,550,000 (Direct Cost: ¥3,500,000、Indirect Cost: ¥1,050,000)
Fiscal Year 2011: ¥1,170,000 (Direct Cost: ¥900,000、Indirect Cost: ¥270,000)
Fiscal Year 2010: ¥1,170,000 (Direct Cost: ¥900,000、Indirect Cost: ¥270,000)
Fiscal Year 2009: ¥2,210,000 (Direct Cost: ¥1,700,000、Indirect Cost: ¥510,000)
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| Keywords | 鉄系高温超伝導体 / 高圧実験 / NMR/NQR / BaFe2As2 / KFe2As2 / BaFe_2As_2 / KFe_2As_2 / 電気抵抗測定 / NMR/NQR測定 / NMR / NQR |
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| Research Abstract |
NMR/NQR and specific heat measurements of (Ba_<1-x>K_x)Fe_2As_2 were performed using high quality single crystals at ambient and high pressure. The superconducting gap in KFe_2As_2 has a multi- gap structure consisted of large and very small gaps. We found that a larger gap had a line-node structure. NMR study in (Ba_<1-x>K_x)Fe_2As_2 showed that the superconducting gap structure changed very smoothly with increasing x for x > 0.4. The superconductivity appears above 15 GPa in BaFe_2As_2 associated with disappearance of anti-ferromagnetic order. The phase change is extremely sensitive to pressure in homogeneity.
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Report
(4 results)
Research Products
(47 results)
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[Presentation] 単結晶Ba1-xKxFe2As2(x=0-0.31)の圧力効果II2012
Author(s)
國分光胤, 小牧泰大, 富沢裕樹, 山崎岳洋, 小林良介, 齊藤拓, 深澤英人, 小堀洋, 竹下直, 木方邦宏, 李哲虎, 伊豫彰, 永崎洋
Organizer
日本物理学会第67回年次大会
Place of Presentation
関西学院大学
Year and Date
2012-03-25
Related Report
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[Presentation] 単結晶Ba_<1-x>K_xFe_2As_2のK高濃度領域の<75>^As-NMR/NQR II2012
Author(s)
長澤洋平, 平野将記, 山田佑自, 齊藤拓, 長島亮, 深澤英人, 小堀洋, 木方邦宏, 李哲虎, 伊豫彰, 永崎洋
Organizer
日本物理学会第67回年次大会
Place of Presentation
関西学院大学
Year and Date
2012-03-25
Related Report
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[Presentation] Ba_<1-x>K_xFe_2As_2(x=0.27-1)の<75>^As-NMR/NQR2011
Author(s)
平野将記, 山田佑自, 齊藤拓, 村野悠一郎, 長島亮, 深澤英人, 小堀洋, 木方邦宏, 李哲虎, 伊豫彰, 永崎洋
Organizer
日本物理学会2011年秋季大会
Place of Presentation
富山大学
Year and Date
2011-09-22
Related Report
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