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Shallow Pockets and Very Strong Coupling Superconductivity in FeSeTe

Materials Science Seminar
Amit Kanigel, Israel Institute of Technology
April 7, 2014 11:00AM to 12:00PM
Building 223, Room S105
We have measured the electronic-structure of FeSexTe1-x above and below TC using ARPES. In the normal state we find multiple bands with remarkably small values for the Fermi energy F. Yet, below TC we find a superconducting gap that is comparable in size to F, leading to a ratio F ~ 0.5 that is much larger than found in any previously studied superconductor.

We also observe an anomalous dispersion of the coherence peak which is very similar to the dispersion found in cold Fermi-gas experiments and which is consistent with the predictions of the BCS-BEC crossover theory.