Insular Superconductivity in a Co-Doped Iron Pnictide CaFe1−xCoxAsF
S. Takeshita, R. Kadono, M. Hiraishi, M. Miyazaki, A. Koda, S. Matsuishi, H. Hosono
DOI 10.1103/PhysRevLett.103.027002 · Physical Review Letters
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Abstract
The presence of a macroscopic phase separation between the superconducting and magnetic phases in CaFe1−xCoxAsF is demonstrated by muon spin rotation measurements conducted across their phase boundaries (x=0.05–0.15). The magnetic phase tends to retain the high transition temperature (Tm>Tc), while Co doping induces strong randomness. The volumetric fraction of the superconducting phase is nearly proportional to the Co content x with a constant superfluid density. These observations suggest the formation of superconducting “islands” (or domains) associated with Co ions in the Fe2As2 layers, indicating a very short coherence length.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| LaFeAsO1-xFx Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 26 | Pressure not reported | unknown |
| CaFe1-xCoxAsF Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 18 | Pressure not reported | midpoint |
| CaFe1-xCoxAsF Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 21 | Pressure not reported | midpoint |
| CaFe1-xCoxAsF Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 22 | Pressure not reported | unknown |
| CaFe1-xCoxAsF Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 18 | Pressure not reported | unknown |
| CaFe1-xCoxAsF Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 21 | Pressure not reported | unknown |
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