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

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

2009-12-16

arxiv.org/abs/0912.3152v2

Phys. Rev. Lett. 104, 097002 (2010)

Physics

Condensed Matter

Strongly Correlated Electrons

5 pages, 4 figures, to appear in Phys. Rev. Lett

Scientific paper

10.1103/PhysRevLett.104.097002

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.

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