Elucidation and search for new quantum states in ferromagnetic quantum critical endpoint
| 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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Report
(4 results)
Research Products
(24 results)
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[Journal Article] 73Ge-Nuclear Magnetic Resonance/Nuclear Quadrupole Resonance Investigation of Magnetic Properties of URhGe2015
Author(s)
H. Kotegawa, K. Fukumoto, T. Toyama, H. Tou, H. Harima, A. Harada, Y. Kitaoka, Y. Haga, E. Yamamoto, Y. Onuki, K. M. Itoh, and E. E. Haller
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Journal Title
J. Phys. Soc. Jpn.
Volume: 84
Issue: 5
Pages: 054710-054710
DOI
NAID
Related Report
Peer Reviewed / Acknowledgement Compliant
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