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Transient spin density wave order induced in the normal state of BaFe 2 As 2 by coherent lattice oscillations

Kim, Kyung Wan ; Pashkin, A. ; Schäfer, H. ; Beyer, M. ; Porer, M. ; Wolf, T. ; Bernhard, Christian ; Demsar, J. ; Huber, R. ; Leitenstorfer, A.

In: EPJ Web of Conferences, 2013, vol. 41, p. 03012

We trace the ultrafast dynamics of the spin density wave gap of the pnictide system BaFe2As2 probing resonantly with broadband multi-terahertz pulses. The photoexcitation in the low-temperature ground state leads to a fast suppression of the spin order followed by a slower recovery process. Surprisingly, in the normal state, we observe periodic oscillations of the spin density wave feature at a...

Ultrafast transient generation of spin-density-wave order in the normal state of BaFe₂As₂ driven by coherent lattice vibrations

Kim, Kyung Wan ; Pashkin, A. ; Schäfer, H. ; Beyer, M. ; Porer, M. ; Wolf, T. ; Bernhard, Christian ; Demsar, J. ; Huber, R. ; Leitenstorfer, A.

In: Nature Materials, 2012, vol. 11, p. 497–501

Femtosecond response of quasiparticles and phonons in superconducting YBa₂Cu₃O7-δ studied by wideband terahertz spectroscopy

Pashkin, A. ; Porer, M. ; Beyer, M. ; Kim, Kyung Wan ; Dubroka, Adam ; Bernhard, Christian ; Yao, X. ; Dagan, Y. ; Hackl, R. ; Erb, A. ; Demsar, J. ; Huber, R. ; Leitenstorfer, A.

In: Physical Review Letters, 2010, vol. 105, no. 6, p. 067001

We measure the anisotropic midinfrared response of electrons and phonons in bulk YBa₂Cu₃O7-δ after femtosecond photoexcitation. A line shape analysis of specific lattice modes reveals their transient occupation and coupling to the superconducting condensate. The apex oxygen vibration is strongly excited within 150 fs, demonstrating that the lattice absorbs a major portion of the...