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 language | English |
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Pages (from-to) | 1697-1705 |
Number of pages | 9 |
Journal | Journal of physics and chemistry of solids |
Volume | 58 |
Issue number | 11 |
DOIs | |
Publication status | Published - 1 Jan 1997 |
Externally published | Yes |