Strong electron correlations in the normal state of the iron-based FeSe0.42Te0.58 superconductor observed by angle-resolved photoemission spectroscopy

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 the iron-based FeSe0.42Te0.58 superconductor observed by angle-resolved photoemission spectroscopy

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 ≈3and16me 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.

Original language	English
Article number	097002
Journal	Physical review letters
Volume	104
Issue number	9
DOIs	https://doi.org/10.1103/PhysRevLett.104.097002
Publication status	Published - 2010 Mar 4
Externally published	Yes

ASJC Scopus subject areas

Physics and Astronomy(all)

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10.1103/PhysRevLett.104.097002

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Tamai, A., Ganin, A. Y., Rozbicki, E., Bacsa, J., Meevasana, W., King, P. D. C., Caffio, M., Schaub, R., Margadonna, S., Prassides, K., Rosseinsky, M. J., & Baumberger, F. (2010). Strong electron correlations in the normal state of the iron-based FeSe0.42Te0.58 superconductor observed by angle-resolved photoemission spectroscopy. Physical review letters, 104(9), [097002]. https://doi.org/10.1103/PhysRevLett.104.097002

Tamai, A, Ganin, AY, Rozbicki, E, Bacsa, J, Meevasana, W, King, PDC, Caffio, M, Schaub, R, Margadonna, S, Prassides, K, Rosseinsky, MJ & Baumberger, F 2010, 'Strong electron correlations in the normal state of the iron-based FeSe0.42Te0.58 superconductor observed by angle-resolved photoemission spectroscopy', Physical review letters, vol. 104, no. 9, 097002. https://doi.org/10.1103/PhysRevLett.104.097002

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AU - Tamai, A.

AU - Ganin, A. Y.

AU - Rozbicki, E.

AU - Bacsa, J.

AU - Meevasana, W.

AU - King, P. D.C.

AU - Caffio, M.

AU - Schaub, R.

AU - Margadonna, S.

AU - Prassides, K.

AU - Rosseinsky, M. J.

AU - Baumberger, F.

PY - 2010/3/4

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N2 - 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 ≈3and16me 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.

AB - 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 ≈3and16me 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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Strong electron correlations in the normal state of the iron-based FeSe0.42Te0.58 superconductor observed by angle-resolved photoemission spectroscopy

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