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Physical review B
We investigated temperature and fluence dependent dynamics of the time resolved optical reflectivity in undoped spin-density-wave (SDW) and doped superconducting (SC) EuFe_2(As,P)_2 with emphasis on the ordered Eu^2+-spin temperature region. The data indicate that the SDW order coexists at low temperature with the SC and Eu^2+-ferromagnetic order. Increasing the excitation fluence leads to a thermal suppression of the Eu^2+-spin order due to the crystal-lattice heating while the SDW order is suppressed nonthermally at a higher fluence.doi:10.1103/physrevb.94.144519 fatcat:wuwgynpqxzhnvn2bxnoa3ka5ca