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Insular superconductivity in Co-doped iron pnictide CaFe_(1-x)Co_xAsF

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arxiv 0812.1670 v3 pith:KYGRNI37 submitted 2008-12-09 cond-mat.supr-con

Insular superconductivity in Co-doped iron pnictide CaFe_(1-x)Co_xAsF

classification cond-mat.supr-con
keywords phasesuperconductingmagneticacrossassociatedboundariescafecfcaf
verification ladder T0 review T1 audit T2 compute T3 formal T4 reserved
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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.

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