Spectrally-resolved femtosecond reflectivity relaxation dynamics in undoped SDW 122-structure iron based pnictides
Pogrebna, A. · Vujičić, N. · Mertelj, T. · Cao, G. · Xu, Z. A. · Chu, J. -H. · Fisher, I. R. · Mihailovic, D.
Original · EN
We systematically investigate temperature- and spectrally-dependent optical reflectivity dynamics in AAs₂Fe₂, (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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