Spectrally-resolved femtosecond reflectivity relaxation dynamics in undoped SDW 122-structure iron based pnictides

A. Pogrebna (1) , N.Vuji\v{c}i\'c (1 , 2) , T. Mertelj (1) , G. Cao (3) , Z. A. Xu (3) , J.-H. Chu (4) , I. R. Fisher (4)

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D. Mihailovic (1) ((1) Complex Matter Dept. Jozef Stefan Institute Jamova Ljubljana Slovenia (2) Institute of Physics Bijeni\v{c}ka Zagreb Croatia (3) Department of Physics Zhejiang University Hangzhou People's Republic of China (4) Geballe Laboratory for Advanced Materials Department of Applied Physics Stanford University USA)

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classification ❄️ cond-mat.supr-con

keywords relaxationdynamicsmagneto-structuralreflectivityresultssloweralternativeanalyzed

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We systematically investigate temperature- and spectrally-dependent optical reflectivity dynamics in AAs$_{2}$Fe$_{2}$, (A=Ba, Sr and Eu), iron-based superconductors parent spin-density-wave (SDW) compounds. Two different relaxation processes are identified. The behavior of the slower process, which is strongly sensitive to the magneto-structural transition, is analyzed in the framework of the relaxation-bottleneck model involving magnons. The results are compared to recent time resolved angular photoemission results (TR-ARPES) and possible alternative assignment of the slower relaxation to the magneto-structural order parameter relaxation is discussed.

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Spectrally-resolved femtosecond reflectivity relaxation dynamics in undoped SDW 122-structure iron based pnictides

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