期刊
SCIENCE ADVANCES
卷 6, 期 45, 页码 -出版社
AMER ASSOC ADVANCEMENT SCIENCE
DOI: 10.1126/sciadv.abb9052
关键词
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资金
- Japan Society for the Promotion of Science (JSPS) [JP19H00651, JP19H01818, JP18H05227, JP19H00649, JP18H01177, JP18K13492, JP20H02600, JP15H05852, JP19H05824, JP19H05826]
- JSPS Research Fellowship for Young Scientists (DC2)
The crossover from the superconductivity of the Bardeen-Cooper-Schrieffer (BCS) regime to the Bose-Einstein condensation (BEC) regime holds a key to understanding the nature of pairing and condensation of fermions. It has been mainly studied in ultracold atoms, but in solid systems, fundamentally previously unknown insights may be obtained because multiple energy bands and coexisting electronic orders strongly affect spin and orbital degrees of freedom. Here, we provide evidence for the BCS-BEC crossover in iron-based superconductors FeSe1-xSx from laser-excited angle-resolved photoemission spectroscopy. The system enters the BEC regime with x=0.21, where the nematic state that breaks the orbital degeneracy is fully suppressed. The substitution dependence is opposite to the expectation for single-band superconductors, which calls for a new mechanism of BCS-BEC crossover in this system.
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