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

A. Tamai; A. Y. Ganin; E. Rozbicki; J. Bacsa; W. Meevasana; P. D. C. King; M. Caffio; R. Schaub; S. Margadonna; K. Prassides; M. J. Rosseinsky; F. Baumberger

doi:10.1103/PhysRevLett.104.097002

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

Strongly Correlated Electrons 2010-03-10 v2

Authors: A. Tamai , A. Y. Ganin , E. Rozbicki , J. Bacsa , W. Meevasana , P. D. C. King , M. Caffio , R. Schaub , S. Margadonna , K. Prassides , M. J. Rosseinsky , F. Baumberger

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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 - 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.

Keywords

iron-based superconductor FeSe0.42Te0.58 strongly correlated metal angle resolved photoemission effective mass mass renormalization

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@article{arxiv.0912.3152,
  title  = {Strong electron correlations in the normal state of FeSe0.42Te0.58},
  author = {A. Tamai and A. Y. Ganin and E. Rozbicki and J. Bacsa and W. Meevasana and P. D. C. King and M. Caffio and R. Schaub and S. Margadonna and K. Prassides and M. J. Rosseinsky and F. Baumberger},
  journal= {arXiv preprint arXiv:0912.3152},
  year   = {2010}
}

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

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

Abstract

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