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Normal state bottleneck and nematic fluctuations from femtosecond quasi-particle relaxation dynamics in Sm(Fe,Co)AsO

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arxiv 1304.2866 v1 pith:OV56M2RM submitted 2013-04-10 cond-mat.supr-con

Normal state bottleneck and nematic fluctuations from femtosecond quasi-particle relaxation dynamics in Sm(Fe,Co)AsO

T. Mertelj , L. Stojchevska , N. D. Zhigadlo , J. Karpinski , D. Mihailovic This is my paper
classification cond-mat.supr-con
keywords structurebreakingdynamicselectronicfoldnormalquasi-particlerelaxation
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We investigate temperature and fluence dependent dynamics of the photoexcited quasi-particle relaxation and low-energy electronic structure in electron-doped 1111-structure Sm(Fe_{0.93}Co_{0.07})AsO single crystal. We find that the behavior is qualitatively identical to the 122-structure Ba(Fe,Co)_{2}As_{2} including the presence of a normal state pseudogap and a marked 2-fold symmetry breaking in the tetragonal phase that we relate to the electronic nematicity. The 2-fold symmetry breaking appears to be a general feature of the electron doped iron pnictides.

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