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Strong electron correlations in the normal state of FeSe0.42Te0.58

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 - 16 m_e corresponding to a mass enhancement over band structure values of m*/m_band ~ 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.

preprint2010arXivOpen access
A. TamaiA. Y. GaninE. RozbickiJ. BacsaW. MeevasanaP. D. C. KingM. CaffioR. SchaubS. MargadonnaK. PrassidesM. J. RosseinskyF. Baumberger
cond-mat.str-el
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Open access12 authors1 topic
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A. TamaiA. Y. GaninE. RozbickiJ. BacsaW. MeevasanaP. D. C. KingM. CaffioR. SchaubS. MargadonnaK. PrassidesM. J. RosseinskyF. Baumberger

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