Correlation effects of exchange splitting and coexistence of spin-density-wave and superconductivity in single crystalline Sr1-xKxFe2As2

TL;DR

This study investigates the relationship between spin-density wave and superconductivity in Sr1-xKxFe2As2, revealing their coexistence and complex exchange splitting behaviors using angle-resolved photoemission spectroscopy.

Contribution

It provides direct experimental evidence that SDW and superconductivity can coexist in iron-pnictides, challenging previous assumptions of their exclusivity.

Findings

SDW and superconductivity coexist in Sr1-xKxFe2As2

Exchange splittings show non-rigid-band behaviors

Data supports coexistence in single crystalline samples

Abstract

The nature of spin-density wave and its relation with superconductivity are crucial issues in the newly discovered Fe-based high temperature superconductors. Particularly it is unclear whether the superconducting phase and spin density wave (SDW) are truly exclusive from each other as suggested by certain experiments. With angle resolved photoemission spectroscopy, we here report exchange splittings of the band structures in Sr1-xKxFe2As2 (x=0,0.1,0.2), and the non-rigid-band behaviors of the splitting. Our data on single crystalline superconducting samples unambiguously prove that SDW and superconductivity could coexist in iron-pnictides.