2007 Fiscal Year Final Research Report Summary
Anomalous superconducting states of unconventional superconductors
| Project/Area Number |
17204031
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| Research Category |
Grant-in-Aid for Scientific Research (A)
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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 |
MATSUDA Yuji Kyoto University, Graduate school of Science, Professor (50199816)
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| Co-Investigator(Kenkyū-buntansha) |
SHIBAUCHI Takasada Kyoto University, Graduate school of Science, Associate Professor (00251356)
TERASHIMA Takahito Kyoto University, Research center for Low Temperature and Materials Sciences, Professor (40252506)
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| Project Period (FY) |
2005 – 2007
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| Keywords | superconductivity / symmetry / heavy fermion / hidden order / vortex lattice / quasiparticle / quantum critical point / strongly correlated system |
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| Research Abstract |
We have studied the superconducting gap symmetry by the thermal transport measurements. Particularly, we have determined the superconducting gap symmetry of URu_2Si_2, by the thermal transport measurements in magnetic field rotating various directions relative to the crystal axes down to dilution refrigerator temperatures. In this system, superconductivity occurs within the so-called hidden order phase, but the detailed nature of the superconductivity is still unclear. We found that the superconducting gap function pas a chiral symmetry, which is quite unique among unconventional superconductors. We also found that the vortex lattice melting in ultraclean URu_2Si_2 single crystals, by the local Hall probe measurements. We have also grown the epitaxial thin films of artificial thin films of CeIn_3 and LaIn_3.
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