Pressure-induced polymerization of ternary fulleride superconductors
Q. Zhu
DOI 10.1103/PhysRevB.52.R723 · Physical Review B
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Abstract
A reversible conversion of the cubic trianionic fulleride superconductors Na2RbC60 and Na2CsC60 to orthorhombic structures is observed at modest pressures (≤ 3 kbar) and ambient temperature. Structure refinement based on synchrotron powder x-ray profiles reveals polymer chains with 9.35 Å intermolecular separation, comparable to that in the metastable monoanionic dimer and polymer phases of KC60 and RbC60. In contrast, K3C60, Rb3C60, etc. are stable to much higher pressures due to their larger lattice constants at ambient pressure.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| Na2RbC60 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 3.4 | Pressure not reported | onset |
| Na2CsC60 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 11.7 | Pressure not reported | onset |
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