Insular superconductivity in Co-doped iron pnictide CaFe${}_{1-x}$Co${}_x$AsF

Abstract

The presence of macroscopic phase separation between the superconducting and magnetic phases in \cfcaf is demonstrated by muon spin rotation (muSR) measurements conducted across their phase boundaries (x=0.05-0.15). The magnetic phase tends to retain the high transition temperature (T_m > T_c), while Co-doping induces strong randomness. The volumetric fraction of superconducting phase is nearly proportional to the Co content $x$ with constant superfluid density. These observations suggest the formation of superconducting "islands" (or domains) associated with Co ions in the Fe${}_2$As${}_2$ layers, indicating a very short coherence length.

5 pages, 5 figures

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Cited by in corpus (4)

• Synthesis, crystal structure and magnetism of beta-Fe1.00(2)Se1.00(3) single crystals
• Pressure versus concentration tuning of the superconductivity in Ba(Fe(1-x)Cox)2As2
• Vortex state in iron-based superconductors with collinear antiferromagnetic cores
• Homogeneous coexistence of SDW and SC states in CaFe(1-x)Co(x)AsF studied by nuclear magnetic resonance