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Electron-phonon coupling and momentum-dependent electron dynamics in EuFe2As2 using time- and angle-resolved photoemission spectroscopy

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arxiv 1008.1561 v2 pith:Y2SS4NYN submitted 2010-08-09 cond-mat.supr-con

Electron-phonon coupling and momentum-dependent electron dynamics in EuFe2As2 using time- and angle-resolved photoemission spectroscopy

L. Rettig , R. Cort\'es , S. Thirupathaiah , P. Gegenwart , H.S. Jeevan , T. Wolf , U. Bovensiepen , M. Wolf
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H.A. D\"urr J. Fink
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classification cond-mat.supr-con
keywords couplingdynamicselectron-phononeufe2as2additionangle-resolvedaroundbrillouin
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The Fe pnictide parent compound EuFe2As2 exhibits a strongly momentum dependent carrier dynamics around the hole pocket at the center of the Brillouin zone. The very different dynamics of electrons and holes cannot be explained solely by intraband scattering and interband contributions have to be considered. In addition, three coherently excited modes at frequencies of 5.6, 3.1 and 2.4 THz are observed. An estimate of the electron-phonon coupling parameter reveals lambda < 0.5, suggesting a limited importance of e-ph coupling to superconductivity in Fe pnictides.

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