Intralayer carbon substitution in the MgB2 superconductor
T. Takenobu, T. Ito, Dam Hieu Chi, K. Prassides, Y. Iwasa
DOI 10.1103/PhysRevB.64.134513 · Physical Review B
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Abstract
We report that the ternary MgB2−xCx compounds adopt an isostructural AlB2-type hexagonal structure in a relatively small range of nominal carbon concentration, x<0.1. The lattice parameter a decreases almost linearly with increasing carbon content x, while the c parameter remains unchanged, indicating that carbon is exclusively substituted in the boron honeycomb layer without affecting the interlayer interactions. The superconducting transition temperature Tc decreases quasilinearly as a function of the carbon concentration, with a slope steeper than that for the isoelectronic Mg1−xAlxB2.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| MgB2 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 39 | Pressure not reported | unknown |
| MgB2-xCx Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | — | Pressure not reported | unknown |
| Mg1-xAlxB2 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | — | Pressure not reported | unknown |
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