| Project/Area Number |
24340085
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| Research Category |
Grant-in-Aid for Scientific Research (B)
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| Allocation Type | Partial Multi-year Fund |
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| Section | 一般 |
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| Research Field |
Condensed matter physics II
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| Research Institution | Kobe University |
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Principal Investigator |
KOTEGAWA Hisashi 神戸大学, 理学(系)研究科(研究院), 准教授 (30372684)
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| Co-Investigator(Kenkyū-buntansha) |
TOU Hideki 神戸大学, 大学院理学研究科, 教授 (60295467)
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| Co-Investigator(Renkei-kenkyūsha) |
SUGAWARA Hitoshi 神戸大学, 大学院理学研究科, 教授 (60264587)
MATSUDA Tatsuma 首都大学東京, 大学院理工学研究科, 准教授 (30370472)
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| Project Period (FY) |
2012-04-01 – 2015-03-31
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| Project Status |
Completed (Fiscal Year 2014)
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| Budget Amount *help |
¥20,410,000 (Direct Cost: ¥15,700,000、Indirect Cost: ¥4,710,000)
Fiscal Year 2014: ¥2,340,000 (Direct Cost: ¥1,800,000、Indirect Cost: ¥540,000)
Fiscal Year 2013: ¥2,210,000 (Direct Cost: ¥1,700,000、Indirect Cost: ¥510,000)
Fiscal Year 2012: ¥15,860,000 (Direct Cost: ¥12,200,000、Indirect Cost: ¥3,660,000)
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| Keywords | 強磁性 / 量子臨界点 / メタ磁性 / 超伝導 / 圧力 / 量子臨界終点 / メタ磁性転移 / UCoAl / NMR / CeIr_3B_2 / CeRuPO |
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| Outline of Final Research Achievements |
We have investigated microscopic states and details of magnetic fluctuation for UCoAl and URhGe which possess a ferromagnetic quantum critical endpoint, by means of nuclear magnetic resonance (NMR). As a result, we have succeeded to observe a development of strong magnetic fluctuations in the vicinity of the quantum critical endpoint of both compounds. The observed magnetic fluctuations are conjectured to play important role for field-induced superconductivity in URhGe.
We have also found a metamegnetic transition which appears under pressure in ferromagnet CeRuPO, and ferromagnetic critical point in CeIr3B2. For helimagnet CrAs, we have found pressure-induced superconductivity. From nuclear quadrupole resonance (NQR) measurements, we have obtained the results indicating that superconductivity in CrAs is mediated by magnetic fluctuations, and that CrAs is the first Cr-based unconventional superconductor.
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