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

S. Takeshita; R. Kadono; M. Hiraishi; M. Miyazaki; A. Koda; S. Matsuishi; H. Hosono

doi:10.1103/PhysRevLett.103.027002

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

Superconductivity 2009-07-13 v3

Authors: S. Takeshita , R. Kadono , M. Hiraishi , M. Miyazaki , A. Koda , S. Matsuishi , H. Hosono

View on arXiv ↗ PDF ↗ DOI ↗

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.

Keywords

insular superconductivity iron pnictide phase separation muon spin rotation Co-doping superfluid density

Cite

@article{arxiv.0812.1670,
  title  = {Insular superconductivity in Co-doped iron pnictide CaFe$_{1-x}$Co$_x$AsF},
  author = {S. Takeshita and R. Kadono and M. Hiraishi and M. Miyazaki and A. Koda and S. Matsuishi and H. Hosono},
  journal= {arXiv preprint arXiv:0812.1670},
  year   = {2009}
}

Comments

5 pages, 5 figures

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

Abstract

Keywords

Cite

Comments

Related papers