2003 Fiscal Year Final Research Report Summary
NMR study of antiferromagnetic superconductor under high pressure and at Low temperatures
| Project/Area Number |
14340109
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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 |
固体物性Ⅱ(磁性・金属・低温)
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| Research Institution | Chiba University |
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Principal Investigator |
KOHORI Yoh Chiba University, Faculty of Science, Prof., 理学部, 教授 (10153660)
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| Project Period (FY) |
2002 – 2003
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| Keywords | ^<115>In NQR / ^<29>Si NMR / CeCoIn_5 / antiferromagnetism / superconductivity / URu_2Si_2 / heavy fermion / 重い電子系物質 |
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| Research Abstract |
The interplay between the superconductivity and the magnetism in the heavy fermion superconductors is a fascinating subject. In particular, the presence of ferromagnetic or antiferromagnetic spin fluctuations has led to the prediction that an unconventional Cooper pair state with non s-wave symmetry is realized in the system. We have study these phenomena in CeTIn_5 system with T=Co, Rh and Ir. We obtained the d-wave superconductivity is realized in the system from NMR and NQR measurements. The pressure dependence of the nuclear spin-lattice relaxation rate of ^<115>In in CeCoIn_5 has shown that the system locates just the Quantum critical point at ambient pressure and becomes non-magnetic with increasing pressure.
The ^<29>Si NMR study of URu_2Si_2 under high pressure has shown that co-existence of the non-magnetic and the antiferromagnetic states is realized at low temperature. The volume fraction of antiferromagnetic phase increases rapidly with increasing pressure.
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