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Origin of superconductivity in Ni-doped SrFe₂As₂ , an Insight from DMFT
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I describe the issues of the competing orders in normal state of a parent and Ni-doped iron pnictide superconductor, SrF e 2 As 2 , using LMTO band structure calculation plus multi orbital dynamical mean-field theory. Strong, electronic correlations along with minimal antiferromagnetic instability create a partially gapped Fermi surface, in qualitative agreement with earlier experiments. A good semiquantitative similarity in both normal and ordered state with the earlier experimental transport data is observed along with suppression of magnetic ordering and explained within a correlated, mul- tiorbital viewpoint. These results suggest that soft electronic fluctuation mediate superconductivity in broad class of parent and underdoped 122 pnictides with suppression of magnetic ordering.
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