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

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.

preprint2014arXivOpen access
A. PogrebnaN. VujičićT. MerteljG. CaoZ. A. XuJ. -H. ChuI. R. FisherD. Mihailovic
cond-mat.supr-con
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A. PogrebnaN. VujičićT. MerteljG. CaoZ. A. XuJ. -H. ChuI. R. FisherD. Mihailovic

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