Pressure-induced polymerization of ternary fulleride superconductors
Journal Article
·
· Physical Review, B: Condensed Matter
- Physics Department, Brookhaven National Laboratory, Upton, New York 11973 (United States)
A reversible conversion of the cubic {ital trianionic} fulleride superconductors Na{sub 2}RbC{sub 60} and Na{sub 2}CsC{sub 60} to orthorhombic structures is observed at modest pressures ({le} 3 kbar) and ambient temperature. Structure refinement based on synchrotron powder x-ray profiles reveals polymer chains with 9.35 A intermolecular separation, comparable to that in the metastable {ital monoanionic} dimer and polymer phases of KC{sub 60} and RbC{sub 60}. In contrast, K{sub 3}C{sub 60}, Rb{sub 3}C{sub 60}, etc. are stable to much higher pressures due to their larger lattice constants at ambient pressure.
- Research Organization:
- Brookhaven National Laboratory
- DOE Contract Number:
- AC02-76CH00016
- OSTI ID:
- 82237
- Journal Information:
- Physical Review, B: Condensed Matter, Journal Name: Physical Review, B: Condensed Matter Journal Issue: 2 Vol. 52; ISSN PRBMDO; ISSN 0163-1829
- Country of Publication:
- United States
- Language:
- English
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