Fluence dependent femtosecond quasi-particle and Eu^{2+} -spin relaxation dynamics in EuFe_{2}(As,P)_{2}

Abstract

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.

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