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

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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Cited by in corpus (8)

• Ultrafast carrier localisation in the pseudogap state of cuprate superconductors from coherent quench experiments
• Coexistence of ferromagnetism and superconductivity in iron based pnictides: a time resolved magnetooptical study
• Dynamics of Order Parameters near Stationary States in Superconductors with a Charge-Density Wave
• Ultrafast destruction and recovery of the spin density wave order in iron based pnictides: a multi-pulse optical study
• Superconducting gap in BaFe${}_2$(As${}_{1-x}$P${}_x$)${}_2$ from temperature dependent transient optical reflectivity
• Transient gap generation in BaFe${}_2$As${}_2$ driven by coherent lattice vibrations
• Multichannel photodiode detector for ultrafast optical spectroscopy
• Fluence dependent femtosecond quasi-particle and Eu^{2+} -spin relaxation dynamics in EuFe_{2}(As,P)_{2}