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