Structure and superconductivity in alkali-ammonia complex fullerides

Y. Iwasa, H. Shimoda, Y. Miyamoto, T. Mitani, Y. Maniwa, O. Zhou*, T. T.M. Palstra

*Corresponding author for this work

Research output: Contribution to journalArticleAcademicpeer-review

8 Citations (Scopus)
27 Downloads (Pure)

Abstract

Alkali ammonia complex fullerides form a rich variety of compounds with unique structural and electronic properties. Intercalation of NH3 into K3C60 produces orthorhombic NH3C60, which undergoes a metal-insulator transition instead of superconductivity that is expected to occur at around 30 K from the empirical relation between Tc and the lattice parameter. Synthesis in liquid ammonia yields new superconducting fullerides (NH3)cursive chiNaA2C60 (0.5 < cursive chi < 1, A = K, Rb). While these compounds retain an fcc cell, they exhibit anomalous dependence of Tc on the lattice. These two examples suggest that the off-centred cations in the octahedral site have a serious effect on superconductivity.

Original languageEnglish
Pages (from-to)1697-1705
Number of pages9
JournalJournal of physics and chemistry of solids
Volume58
Issue number11
DOIs
Publication statusPublished - 1 Jan 1997
Externally publishedYes

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