Physics – Condensed Matter – Superconductivity
Scientific paper
2011-03-10
Phys. Rev. B 84, 235121 (2011)
Physics
Condensed Matter
Superconductivity
4 pages, 3 figures
Scientific paper
A combined density functional theory and functional renormalization group method is introduced which takes into account orbital-dependent interaction parameters to derive the effective low-energy theory of weakly to intermediately correlated Fermi systems. As an application, the competing fluctuations in LiFeAs are investigated, which is the main representative of the 111 class of iron pnictides displaying no magnetic order, but superconductivity, for the parent compound. The superconducting order parameter is found to be of s+- type driven by collinear antiferromagnetic fluctuations. They eventually exceed the ferromagnetic fluctuations stemming from the small hole pocket at the Gamma point, as the system flows to low energies.
Hanke Werner
Platt Christian
Thomale Ronny
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