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Tuning across the BCS-BEC crossover in the multiband superconductor Fe <sub> 1+ <i>y</i> </sub> Se <sub> <i>x</i> </sub> Te <sub> 1โ <i>x</i> </sub> : An angle-resolved photoemission study
A BCS-BEC crossover in a multiband superconductor has been observed experimentally using ARPES.