| Budget Amount *help |
¥5,070,000 (Direct Cost: ¥3,900,000、Indirect Cost: ¥1,170,000)
Fiscal Year 2014: ¥780,000 (Direct Cost: ¥600,000、Indirect Cost: ¥180,000)
Fiscal Year 2013: ¥1,950,000 (Direct Cost: ¥1,500,000、Indirect Cost: ¥450,000)
Fiscal Year 2012: ¥2,340,000 (Direct Cost: ¥1,800,000、Indirect Cost: ¥540,000)
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| Outline of Final Research Achievements |
The organic salt, beta’’-(BEDT-TTF)4[(H3O)Ga(C2O4)3]C6H5NO2 is suggested to be a novel organic superconductor mediated by charge fluctuations. In addition, the upper critical field exceed its Pauli limit was reported.
We performed single crystal 13C-NMR experiments on the sample with selective site isotope substitution and found the charge separation with 0.6e and 0.13e for each. We also discussed the charge disproportionation pattern using the result of the ratio of the peak intensity. We also performed single crystal 13C-NMR experiments on the sample of Fe modification where non-magnetic Ga ions were replaced with magnetic Fe ions to investigate the influence of the magnetism of Fe ions to the superconductivity. As the results we found the negative exchange interaction from Fe ions and estimated the characteristic timescale of Fe ions dynamics under the field, suggesting the possibility of a field induced superconductivity of the Fe salt.
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