Superconductivity at 18 K in potassium-doped C60

Hebard, A. F.; Rosseinsky, M. J.; Haddon, Robert C.; Murphy, D. W.; Glarum, S. H.; Palstra, Thomas; Ramirez, A. P.; Kortan, A. R.

doi:10.1038/350600a0

Cited by 3,028 publications

(1,058 citation statements)

References 6 publications

Supporting

Mentioning

1,017

Contrasting

Unclassified

Order By: Relevance

“…In 1991, the discovery of fullerene intercalation compounds known as "fullerides" added a new family of organic superconductors [57][58][59]. Fullerides revealed higher T c values compared to GICs ranging from 18 K for K 3 C 60 up-to 39 K for Cs 3 C 60 [58][59][60]. In 2007 Hlinka et al [61] discovered superconductivity in CaC 6 GICs with an elevated T c of 11.5 K renewing the interest in GICs.…”

Section: Superconductivity In Stage I Gic and Implications For Intercmentioning

confidence: 99%

“…By 1990's higher transition temperatures were observed for C 6 K, C 3 K, and C 2 Na with values of T c = 1.5, 3, and 5 K, respectively [56]. In 1991, the discovery of fullerene intercalation compounds known as "fullerides" added a new family of organic superconductors [57][58][59]. Fullerides revealed higher T c values compared to GICs ranging from 18 K for K 3 C 60 up-to 39 K for Cs 3 C 60 [58][59][60].…”

Section: Superconductivity In Stage I Gic and Implications For Intercmentioning

confidence: 99%

See 1 more Smart Citation

Raman spectroscopy of graphite intercalation compounds: Charge transfer, strain, and electron–phonon coupling in graphene layers

Chacón-Torres

Wirtz

Pichler

2014

Physica Status Solidi (b)

View full text Add to dashboard Cite

Graphite intercalation compounds (GICs) are an interesting and highly studied field since 1970's. It has gained renewed interest since the discovery of superconductivity at high temperature for CaC 6 and the rise of graphene. Intercalation is a technique used to introduce atoms or molecules into the structure of a host material. Intercalation of alkali metals in graphite has shown to be a controllable procedure recently used as a scalable technique for bulk production of graphene, and nano-ribbons by induced exfoliation of graphite. It also creates supra-molecular interactions between the host and the intercalant, inducing changes in the electronic, mechanical, and physical properties of the host. GICs are the mother system of intercalation also employed in fullerenes, carbon nanotubes, graphene, and carbon-composites. We will show how a combination of Raman and ab-initio calculations of the density and the electronic band structure in GICs can serve as a tool to elucidate the electronic structure, electron-phonon coupling, charge transfer, and lattice parameters of GICs and the graphene layers within. This knowledge of GICs is of high importance to understand superconductivity and to set the basis for applications with GICs, graphene and other nano-carbon based materials like nanocomposites in batteries and nanoelectronic devices.

show abstract

Section: Superconductivity In Stage I Gic and Implications For Intercmentioning

confidence: 99%

Section: Superconductivity In Stage I Gic and Implications For Intercmentioning

confidence: 99%

Raman spectroscopy of graphite intercalation compounds: Charge transfer, strain, and electron–phonon coupling in graphene layers

Chacón-Torres

Wirtz

Pichler

2014

Physica Status Solidi (b)

View full text Add to dashboard Cite

show abstract

“…of C 60 molecules in the solid state has clearly demonstrated its conductivity and superconductivity upon doping with alkali metal atoms (potassium or rubidium) [132,133]. The crystal structure adopted by Coo molecules shows that the mass center of each C 60 molecule is positioned in a fcc lattice, and the whole molecule behaves like a single large atom.…”

Section: Jumps With An Icosahedral Symmetrymentioning

confidence: 99%

Scalar operators in solid-state NMR

Sun

1991

View full text Add to dashboard Cite

“…XRD spectrum of the LB film obtained by 150 dipping cycles of derivative 2 deposited onto a silicon substrate (curve a) and XRD profile collected on the pure silicon substrate (curve b). 1 The model takes into account a parallel-sided, isotropic film of refractive index n 1 between media of indices n 0 =1 (air) and n 2 (fused quartz substrate), the latter supposed to be very thick with respect to the wavelength. According to this model, R(u) and T(u) can be expressed by the following equations:…”

Section: Uv -Vis Spectramentioning

confidence: 99%

“…Widespread attention has been paid to fullerene based materials, in view of its superconductivity in the interval of 18-30 K when doped, [1][2][3][4] and of its charge transfer, [5][6][7] and photochemical properties [8] Incorporation of C 60 into thin ordered films is an important goal for its application in new materials; but its successful inclusion into working devices requires that uniform, well ordered and relatively defect-free films be fabricated. A variety of techniques are known to produce fullerene thin films, such as vacuum sublimation, [9] solvent evaporation from a fine suspension, [10] self-assembly, [11] and Langmuir-Blodgett (LB) deposition [12].…”

Section: Introductionmentioning

confidence: 99%

Peptide anchored Langmuir–Blodgett films of a fullerene amphiphile

Tundo

Perosa

Selva

et al. 2001

Colloids and Surfaces A: Physicochemical and Engineering Aspect

View full text Add to dashboard Cite

A new amphiphilic derivative of fullerene C 60 bearing an oligoglycyl tail (C 60 CHCOgly 2 OEt, 2) formed stable Langmuir floating films at the air-water interface. This occurred when the molecular assembly was stabilized by anchoring the amphiphilic C 60 's to the aqueous subphase, via hydrogen bonding interactions between a dipeptide (Gly-L-Leu) dissolved in the water subphase, and the oligoglycyl chain. The compression (y−A) isotherm of the Langmuir floating film constructed in such a way showed no hysteresis, was steep, and evidenced that the monolayer collapsed at a surface pressure yE65 mN m − 1 , thus confirming that the film was tightly packed, extremely stable, and rigid. A limiting area per molecule of 89.1 A , 2 was extrapolated, in agreement with the calculated cross-section area of the C 60 fullerene. On the contrary, when the dipeptide was absent and pure water was used as the subphase, the y −A isotherm yielded a limiting area B55 A , 2 which indicated the formation of multiple layers; moreover it showed significant hysteresis, the film was fragile, and it collapsed at y :50 mN m − 1 . Once anchored by the dipeptide, the floating monolayer of 2 could be transferred onto hydrophobic quartz, glass and silicon substrates, by successive vertical dipping cycles, each cycle made up of two down-strokes and two up-strokes, to yield the Langmuir-Blodgett film. Up to 200 down-and up-strokes could be repeated reproducibly, a noteworthy result for non-covalently assembled LB films of fullerenes. The transfer ratio was 1.0, except for the second down-stroke of each cycle that gave a transfer ratio of zero, making the sequence of successful transfers: D, U, U, (cleaning and spreading), D, U, U, (cleaning and spreading), and so on (D= down-stroke, U= up-stroke). The total number of deposited layers was therefore 150. X-ray diffraction spectra were registered and exhibited a peak, which was fitted by a Montecarlo method of simulation to obtain the distribution of the repeat unit responsible for scattering; such distribution, with thickness between 20 and 60 A , , was consistent with the size of the amphiphile and the transfer sequence. The UV-Vis spectra of the LB film exhibited the characteristic C 60 bands, and the absorption peaks in the 200-400 nm range were proportional to the number of layers, indicating that the deposition was reproducible and that the molecular environment of C 60 in each layer remained constant. © 2001 Elsevier Science B.V. All rights reserved.

show abstract

Superconductivity at 18 K in potassium-doped C60

Abstract: Take-down policy If you believe that this document breaches copyright please contact us providing details, and we will remove access to the work immediately and investigate your claim.

Cited by 3,028 publications

References 6 publications

Raman spectroscopy of graphite intercalation compounds: Charge transfer, strain, and electron–phonon coupling in graphene layers

Raman spectroscopy of graphite intercalation compounds: Charge transfer, strain, and electron–phonon coupling in graphene layers

Scalar operators in solid-state NMR

Peptide anchored Langmuir–Blodgett films of a fullerene amphiphile

Contact Info

Product

Resources

About