Journal
PHYSICAL REVIEW LETTERS
Volume 122, Issue 7, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevLett.122.077001
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Funding
- Ministry of Education, Culture, Sports, Science and Technology of Japan [15H02106, 15H05852, 16H04024, 18H01177, 18H05227]
- DFG-ANR Project [ER463/8-1]
- DAAD PPP USA [N57316180]
- Ministry of Science and Higher Education of the Russian Federation [K2-294 2017-085]
- Grants-in-Aid for Scientific Research [16H04024, 15H02106, 18H01177, 18H05227] Funding Source: KAKEN
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FeSe is argued as a superconductor in the Bardeen-Cooper-Schrieffer Bose-Einstein condensation crossover regime where the superconducting gap size and the superconducting transition temperature T-c are comparable to the Fermi energy. In this regime, vortex bound states should be well quantized and the preformed pairs above T-c may yield a pseudogap in the quasiparticle-excitation spectrum. We performed spectroscopic-imaging scanning tunneling microscopy to search for these features. We found Friedel-like oscillations near the vortex, which manifest the quantized levels, whereas the pseudogap was not detected. These apparently conflicting observations may be related to the multiband nature of FeSe.
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