| Budget Amount *help |
¥17,680,000 (Direct Cost: ¥13,600,000、Indirect Cost: ¥4,080,000)
Fiscal Year 2017: ¥2,340,000 (Direct Cost: ¥1,800,000、Indirect Cost: ¥540,000)
Fiscal Year 2016: ¥2,080,000 (Direct Cost: ¥1,600,000、Indirect Cost: ¥480,000)
Fiscal Year 2015: ¥13,260,000 (Direct Cost: ¥10,200,000、Indirect Cost: ¥3,060,000)
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| Outline of Final Research Achievements |
The superconducting semimetal FeSe has been found to be deep inside the BCS-BEC crossover regime. One of the significant achievements of this project is our successful growth of clean single crystals of FeSe1-xSx superconductors. Based on that, we have investigated their exotic electronic state and quantum condensate. In FeSe, experimental signatures of preformed Cooper pairing and emergence of a distinct field-induced superconducting phase with an unprecedented large spin imbalance have been discovered. In FeSe1-xSx superconductors, a novel type of quantum critical point (QCP) of pure nematic order without accompanying other orders is discovered. Moreover, a dramatic change in the superconducting gap structure is found across the nematic QCP of FeSe1-xSx. These fruitful findings obtained in this project provide pivotal information towards the understanding of exotic superconductors.
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