Common Crystalline and Magnetic Structure of superconducting A2Fe4Se5

TL;DR

This study reveals that various alkali metal and thallium intercalated iron selenide superconductors share a common crystalline and magnetic structure, providing a structural basis for understanding their electronic properties.

Contribution

It demonstrates that different A2Fe4Se5 superconductors have identical crystal and magnetic structures, establishing a unified framework for their electronic behavior.

Findings

Shared crystal structure across different A2Fe4Se5 superconductors

Identical block checkerboard antiferromagnetic order observed

Provides structural basis for electronic process investigations

Abstract

Single crystal neutron diffraction study has been performed on new superconductor A2Fe4Se5, where A = Cs, K, (Tl,Rb) and (Tl,K), and the same Fe vacancy ordered crystal structure and the same block checkerboard antiferromagne tic order recently discovered in the K2Fe4Se5 superconductor are observed. Thus, all known alkali metal and/or Tl intercalated iron selenide superconductors share common crystalline and magnetic structure. Investigation on electronic process in these new superconductors, for which a different electronic structure from those in previous Fe-based high-Tc superconductors is emerging, now has a valid structural and magnetic framework.