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

2); (2) Institute of Physics; (3) Department of Physics; (4) Geballe Laboratory for Advanced Materials; A. Pogrebna (1); Bijeni\v{c}ka; Croatia; Department of Applied Physics; D. Mihailovic (1) ((1) Complex Matter Dept.; G. Cao (3)

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

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arxiv 1402.5811 v1 pith:HFOYYGRO submitted 2014-02-24 cond-mat.supr-con

A. Pogrebna (1) , N.Vujičić (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 Bijenička 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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keywords relaxationdynamicsmagneto-structuralreflectivityresultssloweralternativeanalyzed

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abstract

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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