2014 Fiscal Year Final Research Report
STM/STS and break-junction tunneling spectroscopy of layered nitro-chloride superconductors
| Project/Area Number |
24540377
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| Research Category |
Grant-in-Aid for Scientific Research (C)
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| Allocation Type | 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 | Hiroshima University |
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Principal Investigator |
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| Research Collaborator |
SUGIMOTO Akira 広島大学, 大学院総合科学研究科, 助教
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| Project Period (FY) |
2012-04-01 – 2015-03-31
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| Keywords | 層状窒化物 / 高温超伝導 / STM／STS / Break-Junction tunneling / ナノスケール電子状態 / エネルギーギャップ / 非従来型超伝導機構 |
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| Outline of Final Research Achievements |
We investigated the electronic properties of the layered nitro-chloride superconductors by means of low-temperature ultra-high-vacuum scanning microscopy/spectroscopy (STM/STS) and break-junction tunneling spectroscopy (BJTS) with clean surface conditions. The STM measurements clarified the electronic inhomogeneity in sub-nanometer scale of the crystal surface. The averaged-superconducting gap values, which are much larger than the BCS prediction, were found to be independent of the critical temperatures Tc. From a series of the experiments, it is pointed out that the possible enhancement of Tc above 30 K should occur when the electronic inhomogeneity of the sample is being suppressed. Both the inhomogeneity and the huge magnitude of the gap size confirmed in the present research resemble those of the high-Tc cuprates except for the gap symmetry which can be described by the conventional picture in the nitro-chloride superconductors.
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| Free Research Field |
超伝導ナノスケール電子物理学
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