Shallow pockets and very strong coupling superconductivity in FeSe_xTe_1-x
| Autor: | Daniel K. Podolsky, E. Lahoud, Amit Kanigel, K. B. Chashka, Y. Lubashevsky |
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| Jazyk: | angličtina |
| Rok vydání: | 2011 |
| Předmět: |
Physics
Superconductivity Condensed Matter::Quantum Gases Condensed matter physics Strongly Correlated Electrons (cond-mat.str-el) Chalcogenide Condensed Matter - Superconductivity Crossover General Physics and Astronomy FOS: Physical sciences Superconductivity (cond-mat.supr-con) chemistry.chemical_compound Condensed Matter - Strongly Correlated Electrons chemistry Condensed Matter::Superconductivity Strong coupling Condensed Matter::Strongly Correlated Electrons Atomic physics |
| Popis: | We measured the electronic-structure of FeSe_xTe_1-x above and below Tc. In the normal state we find multiple bands with remarkably small values for the Fermi energy, E_F. Yet,below Tc we find a superconducting gap, Delta, that is comparable in size to E_F, leading to a ratio Delta/E_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. |
| Databáze: | OpenAIRE |
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