Origin of superconductivity in Ni-doped SrFe_2As_2 , an Insight from DMFT

TL;DR

This paper investigates the origin of superconductivity in Ni-doped SrFe2As2 using advanced electronic structure calculations, revealing the role of electronic correlations and fluctuations in mediating superconductivity.

Contribution

It provides a detailed theoretical analysis combining LMTO and DMFT to explain the electronic correlations and their connection to superconductivity in Ni-doped SrFe2As2.

Findings

Strong electronic correlations create a partially gapped Fermi surface.

Suppression of magnetic order correlates with superconductivity.

Results align with experimental transport data.

Abstract

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.