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Doping dependence and electron–boson coupling in the ultrafast relaxation of hot electron populations in Ba(Fe₁₋ₓCoₓ)₂As₂

Avigo, I.; Thirupathaiah, S.; Ligges, M.; Wolf, T.; Fink, J.; Bovensiepen, U.

Using femtosecond time- and angle-resolved photoemission spectroscopy we investigate the effect of
electron doping on the electron dynamics in Ba(Fe1-xCox)2As2 in a range of $0\leq \ $x< 0.15 at
temperatures slightly above the Néel temperature. By analyzing the time-dependent photoemission
intensity of the pump laser excited population as a function of energy, we found that the relaxation
times at 0 < E - E$_{F}$ < 0.2 eV are doping dependent and about 100 fs shorter at optimal doping than
for overdoped and parent compounds. Analysis of the relaxation rates also reveals the presence of a
pump fluence dependent step in the relaxation time at E - E$_{F}$ = 200 meV whichwe explain by
coupling of the excited electronic system to a boson of this energy.Wecompare our results with static
ARPES and transport measurements and find disagreement and agreement concerning the dopingdependence,
respectively.Wediscuss the effect of the electron–boson coupling on the energydependent
relaxation and assign the origin of the boson to a magnetic excitation.

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Volltext §
DOI: 10.5445/IR/1000059477
DOI: 10.1088/1367-2630/18/9/093028
Zitationen: 3
Web of Science
Zitationen: 3
Seitenaufrufe: 4
seit 27.06.2018
Downloads: 27
seit 02.10.2016
Zugehörige Institution(en) am KIT Institut für Festkörperphysik (IFP)
Publikationstyp Zeitschriftenaufsatz
Jahr 2016
Sprache Englisch
Identifikator ISSN: 1367-2630
KITopen-ID: 1000059477
HGF-Programm 43.21.01 (POF III, LK 01)
Erschienen in New journal of physics
Band 18
Heft 9
Seiten 093028
Nachgewiesen in Web of Science
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