Journal
PHYSICAL REVIEW LETTERS
Volume 104, Issue 9, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevLett.104.097002
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Funding
- Scottish Funding Council
- European Research Council
- UK EPSRC [EP/C511794, EP/F006640]
- EPSRC [EP/F006640/1, EP/G037949/1] Funding Source: UKRI
- Engineering and Physical Sciences Research Council [EP/F006640/1, EP/C511794/1, EP/G037949/1] Funding Source: researchfish
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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 approximate to 3 and 16m(e) corresponding to a mass enhancement over band structure values of m*/m(band) approximate to 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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