Phase diagram and a possible unified description of intercalated iron selenide superconductors

Details Phase diagram and a possible unified description of intercalated iron selenide superconductors Phase diagram and a possible unified description of intercalated iron selenide superconductors

2011-03-09

arxiv.org/abs/1103.1902v3

Phys. Rev. Lett. 107, 167001 (2011)

Physics

Condensed Matter

Superconductivity

4 pages, 5 figures

Scientific paper

10.1103/PhysRevLett.107.167001

We propose a theoretical description of the phase diagram and physical properties in A2Fe4Se5-type (A=K, Tl) compounds based on a coexistent local moment and itinerant electron picture. Using neutron scattering and ARPES measurements to fix the general structure of the local moment and itinerant Fermi pockets, we find a superconducting (SC) regime with s-wave pairing at the M pockets and an incipient sign-change s-wave near the Gamma point, which is adjacent to an insulating state at low doping and a charge-density-wave (CDW) state at high doping. The uniform susceptibility and resistivity are found to be consistent with the experiment. The main distinction with iron pnictide superconductors is also discussed.

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