Recent Advances in Fullerene Superconductivity

Margadonna, Serena; Prassides, Kosmas

doi:10.1006/jssc.2002.9762

Cited by 107 publications

(95 citation statements)

References 70 publications

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“…The most common are fullerides prepared from alkali or alkali earth metals such as Li, [270] Na, [271] K, [272] Cs, [273] Rb, [274] Mg, [275], and Ba, [276], the lanthanide group metals Sm, [277] Eu, [278] and Yb, [279] and mixed metal compounds which have all been studied and reviewed extensively in recent years. Alkali metal doped fullerides display a range of useful properties such as superconductivity, [280,281] ferromagnetism and magnetoresistance, as well as the potential for application in hydrogen storage. [282] Examples of transition metal doped fullerides are less abundant, and are summarised in Table 7.…”

Section: Ionic Fulleride Saltsmentioning

confidence: 99%

Harnessing the Synergistic and Complementary Properties of Fullerene and Transition-Metal Compounds for Nanomaterial Applications

2015

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Section: Ionic Fulleride Saltsmentioning

confidence: 99%

Harnessing the Synergistic and Complementary Properties of Fullerene and Transition-Metal Compounds for Nanomaterial Applications

2015

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“…We present calculations of the interaction energy of C 60 fullerene molecules encapsulated in single-walled carbon nanotubes (SWCNTs), systems known as peapods [1]. We focus on the dependence on the molecular orientations by taking the molecular structure fully into account.…”

Section: Abstract: Fullerenes Nanotubes Peapodsmentioning

confidence: 99%

“…1a). An alternative bridging mechanism involves the formation of single interfullerene C-C covalent bonds, as encountered in 1D C 60 3-(Na 2 RbC 60 ) [1] (Fig. 1b) and 2D C 60 4-(Na 4 C 60 ) 3 [2] fulleride polymers.…”

mentioning

confidence: 99%

Mixed interfullerene bonding motifs in C₆₀based polymers

Margadonna¹,

Verberck²

2006

Acta Cryst Sect A

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An unexpected discovery in fullerene chemistry has been the ease with which C 60 units can covalently bond together to give rise to polymerized fullerene networks with a variety of structural architectures. Such fullerene-bridged arrays display varying dimensionality and interesting electronic (metallic behavior) and magnetic (ferromagnetism above room temperature) properties. The predominant C-C bridging structural motif, encountered in photo-and pressure-polymerized neutral C 60 and in the AC 60 (A = K, Rb, Cs) solids arises from [2+2] cycloaddition reactions, which result in the formation of 4-membered carbon rings, fusing together adjacent molecules and propagating in one (1D chains) or two (2D layers) dimensions (Fig. 1a). An alternative bridging mechanism involves the formation of single interfullerene C-C covalent bonds, as encountered in 1D C 60 3-(Na 2 RbC 60 ) [1] (Fig. 1b) and 2D C 60 4-(Na 4 C 60 ) 3 [2] fulleride polymers. We have recently started working on the related fulleride salt, Li 4 C 60 and its structural properties were probed by X-ray powder diffraction as a function of temperature between ambient conditions and 450(C. Very surprisingly we found that at room temperature the ground state of Li 4 C 60 is a two-dimensional polymer with monoclinic crystal symmetry and an unprecedented architecture, combining both [2+2] cycloaddition and single C-C bridging motifs [3,4] (Fig. 1c). This structure is the first example of a fullerene polymer with a mixed mode of interfullerene bridging and opens the way for the synthesis and study of new C 60 -based 1D, 2D and 3D polymers. Increasing the temperature leads to the disruption of the bridging motifs and to the simultaneous formation of a fcc monomeric phase.

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“…However, there are many other important facts to take into account in a discussion of alkali fullerides and superconductivity. We refer to a recent paper by Margadonna and Prassides [43]. If λ is quite large compared to ∆, then, at a high temperature the electrons would not be delocalised by the ordinary mechanism.…”

Section: T 2 1u Electron Pairs In Fulleridesmentioning

confidence: 99%

Mixed valence model for superconductivity

Larsson¹

2003

Braz. J. Phys.

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Superconductivity often occurs in crystals with one active electron per site with charge density wave (CDW) or spin density wave (SDW) as 'mother state'. It is proposed that superconductivity is possible when the differences in equilibrium geometry and energy between the diabatic CDW and SDW states are so small that there is interaction between them via the zero point vibrations. Electron pairing in real space is directly related to oxidation states being different in two units. Three valence states in succession have to be stable (ground state or low-energy excited states) and we therefore refer to this mixed valence model as the MV-3 model. Examples are chosen from bismuthates, cuprates, and fullerides. The theory is simple and straightforward and offers solutions to other important problems as well, for example for A 3 C 60 (A = K, Rb), that (1) there are no magnetic moments in crystal phase, and (2) that these systems are superconducting metals while A 4 C 60 are insulators.

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Recent Advances in Fullerene Superconductivity

Cited by 107 publications

References 70 publications

Harnessing the Synergistic and Complementary Properties of Fullerene and Transition-Metal Compounds for Nanomaterial Applications

Harnessing the Synergistic and Complementary Properties of Fullerene and Transition-Metal Compounds for Nanomaterial Applications

Mixed interfullerene bonding motifs in C₆₀based polymers

Mixed valence model for superconductivity

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Recent Advances in Fullerene Superconductivity

Cited by 107 publications

References 70 publications

Harnessing the Synergistic and Complementary Properties of Fullerene and Transition-Metal Compounds for Nanomaterial Applications

Harnessing the Synergistic and Complementary Properties of Fullerene and Transition-Metal Compounds for Nanomaterial Applications

Mixed interfullerene bonding motifs in C60based polymers

Mixed valence model for superconductivity

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Mixed interfullerene bonding motifs in C₆₀based polymers