Anisotropic magnetic and superconducting properties of CaFe2−xCoxAs2 (x=0,0.06) single crystals
Neeraj Kumar, R. Nagalakshmi, R. Kulkarni, P. L. Paulose, A. K. Nigam, S. K. Dhar, A. Thamizhavel
DOI 10.1103/PhysRevB.79.012504 · Physical Review B
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Abstract
We report on anisotropic dc magnetic susceptibility χ(T), electrical resistivity ρ(T), and heat-capacity C(T) measurements on the single crystals of CaFe2−xCoxAs2 for x=0 and 0.06. Large-sized single crystals were grown by the high-temperature solution method with Sn as the solvent. The spin-density wave (SDW)/structural transition observed at 170 K in the pure CaFe2As2 compound is suppressed for the Co-doped sample CaFe1.94Co0.06As2 and superconductivity is observed at ≃17 K. The superconducting transition has been confirmed from the magnetization and electrical resistivity studies. The F57e Mössbauer spectrum in CaFe2As2 indicates that the SDW ordering is incommensurate with the crystal lattice. In the Co-doped sample, a prominent paramagnetic line at 4.2 K is observed indicating a weakening of the SDW state.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| CaFe1.94Co0.06As2 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 17 | Pressure not reported | onset |
| CaFe1.94Co0.06As2 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 17 | Pressure not reported | onset |
| 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 |
| LaFeAsO1-xFx Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 43 | 4 GPa | unknown |
| SmFeAsO1-xFx Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 43 | Pressure not reported | unknown |
| Ba0.55K0.45Fe2As2 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 38 | Pressure not reported | unknown |
| BaFe1.8Co0.2As2 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 22 | Pressure not reported | unknown |
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