Decoupling of the superconducting and magnetic (structural) phase transitions in electron-doped BaFe2As2

Abstract

Study and comparison of over 30 examples of electron doped BaFe2As2 for transition metal (TM) = Co, Ni, Cu, and (Co/Cu mixtures) have lead to an understanding that the suppression of the structural/antiferromagnetic phase transition to low enough temperature in these compounds is a necessary condition for superconductivity, but not a sufficient one. Whereas the structural/antiferromagnetic transitions are suppressed by the number of TM dopant ions (or changes in the c-axis) the superconducting dome exists over a limited range of values of the number of electrons added by doping (or values of the {a/c} ratio). By choosing which combination of dopants are used we can change the relative positions of the upper phase lines and the superconducting dome, even to the extreme limit of suppressing the upper structural and magnetic phase transitions without the stabilization of low temperature superconducting dome.

Cited by in corpus (6)

• High-temperature superconductivity in iron-based materials
• Critical change in the Fermi surface of iron arsenic superconductors at the onset of superconductivity
• Superconductivity in Ca10(Ir4As8)(Fe2As2)5 with Square-Planar Coordination of Iridium
• Possible unconventional superconductivity in substituted BaFe${}_2$As${}_2$ revealed by magnetic pair-breaking studies
• Anisotropic thermal expansion of AEFe2As2 (AE = Ba, Sr, Ca) single crystals
• Strong similarities between the local electronic structure of insulating iron pnictide and lightly doped cuprate