2010 Fiscal Year Final Research Report
Microscopic Investigation of the coexistence state of Magnetism and Superconductivity in Uranium-based Heavy-Fermion Superconductors
| Project/Area Number |
20340088
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| Research Category |
Grant-in-Aid for Scientific Research (B)
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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 | Kyoto University |
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Principal Investigator |
ISHIDA Kenji Kyoto University, 大学院・理学研究科, 教授 (90243196)
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| Project Period (FY) |
2008 – 2010
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| Keywords | 磁気共鳴 |
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| Research Abstract |
We have studied coexistence of ferromagnetism and superconductivity in ferromagnetic superconductor of UCoGe from the microscopic NMR measurement using a high-quality single crystal. Below the ferromagnetic transition, whole region of the sample is in ferromagnetic state, and a nearly half of the region becomes superconductive below Tc. We also have investigated magnetic fluctuations in the compound, and found that longitudinal ferromagnetic fluctuations along the ordered moments directed to the c axis is dominant at low temperatures. The magnetic fluctuations we observed have been suggested to be favorable for spin-triplet superconductivity from theoretical point of view. These results suggest the possibility that spin-triplet superconductivity is realized in UCoGe.
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