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

Ultrafast and intense optical pulses have been used to study spin-density-waves in pnictide compounds, which are known to exhibit unconventional superconductivity. The results show that the magnetic order follows lattice motion, which suggests that a spin–phonon coupling may play an important role in the formation of spin-density-waves and superconductivity.