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Strong Electron Correlations in the Normal State of the Iron-Based FeSe0.42Te0.58 Superconductor Observed by Angle-Resolved Photoemission Spectroscopy

Published inPhysical review letters, vol. 104, no. 09, 097002
Publication date2010
Abstract

We investigate the normal state of the “11” iron-based superconductor FeSe0.42Te0.58 by angle-resolved photoemission. Our data reveal a highly renormalized quasiparticle dispersion characteristic of a strongly correlated metal. We find sheet dependent effective carrier masses between ≈3 and 16me corresponding to a mass enhancement over band structure values of m∗/mband≈6–20. This is nearly an order of magnitude higher than the renormalization reported previously for iron-arsenide superconductors of the “1111” and “122” families but fully consistent with the bulk specific heat.

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TAMAI, Anna et al. Strong Electron Correlations in the Normal State of the Iron-Based FeSe<sub>0.42</sub>Te<sub>0.58</sub> Superconductor Observed by Angle-Resolved Photoemission Spectroscopy. In: Physical review letters, 2010, vol. 104, n° 09, p. 097002. doi: 10.1103/PhysRevLett.104.097002
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ISSN of the journal0031-9007
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