Superconductivity of Bulk<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:msub><mml:mi>CaC</mml:mi><mml:mn>6</mml:mn></mml:msub></mml:math>

Eméry, N.; Hérold, Claire; d’Astuto, Matteo; Garcia, Vincent; Bellin, Christophe; Marêché, J.F.; Lagrange, Philippe; Loupias, G.

doi:10.1103/physrevlett.95.087003

Cited by 418 publications

(368 citation statements)

References 15 publications

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“…We report two surface types. The first matches the expected structure represented in Figure 1a: a hexagonal lattice (a = 0.250 nm), typical of STM-imaged graphite 23 or graphene 24 , superposed on a hexagonal Ca superlattice (0.433 nm = √3a) rotated by 30° (R30°) with respect to the primary lattice 25 . This surface is referred to as the expected phase, and is shown in Figure 2a.…”

Section: Bulk Transport Measurementssupporting

confidence: 71%

“…The CaC 6 samples were fabricated from a highly orientated pyrolytic graphite platelet by the Lithium/Calcium alloy method 25 . The phase purity of the silver-coloured samples was confirmed by X-ray diffraction to be > 99%.…”

Section: Methodsmentioning

confidence: 99%

“…Consequently, the new unit cell is 3√3a×√3a R30° (1.299 nm×0.433 nm), as shown in Figure 2c The Ca atomic corrugation for the stripe phase is ~0.020 nm that is much lower than the X-ray-measured C-Ca distance of 0.226 nm (ref. 25) and the Ca 2 + ionic radius of 0.100 nm, indicating that the Ca atoms are subsurface and that the surface is graphene- terminated. Indeed, we found that high-resolution imaging of the stripe phase requires a high-purity sample and a large flat graphene-terminated surface.…”

Section: Bulk Transport Measurementsmentioning

confidence: 99%

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Charge density waves in the graphene sheets of the superconductor CaC6

et al. 2011

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Graphitic systems have an electronic structure that can be readily manipulated through electrostatic or chemical doping, resulting in a rich variety of electronic ground states. Here we report the first observation and characterization of electronic stripes in the highly electrondoped graphitic superconductor, CaC 6 , by scanning tunnelling microscopy and spectroscopy. The stripes correspond to a charge density wave with a period three times that of the Ca superlattice. Although the positions of the Ca intercalants are modulated, no displacements of the carbon lattice are detected, indicating that the graphene sheets host the ideal charge density wave. This provides an exceptionally simple material-graphene-as a starting point for understanding the relation between stripes and superconductivity. Furthermore, our experiments suggest a strategy to search for superconductivity in graphene, namely in the vicinity of striped 'Wigner crystal' phases, where some of the electrons crystallize to form a superlattice.

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Section: Bulk Transport Measurementssupporting

confidence: 71%

Section: Methodsmentioning

confidence: 99%

Section: Bulk Transport Measurementsmentioning

confidence: 99%

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Charge density waves in the graphene sheets of the superconductor CaC6

et al. 2011

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“…Graphite related materialas have attracted considerable interest in the last few years, mostly due to the appealing possibility of tuning their physical properties 10 . In particular it is possible to vary the conductivity of graphite from semi-metallic 11 to metallic and to superconducting [12][13][14][15][16][17][18][19][20] by adjusting the level of intercalation. In Ca intercalated graphite superconductivity arises from the strong electron-phonon coupling provided both by C and Ca phonon modes 16,21 .…”

mentioning

confidence: 99%

Phononic self-energy effects and superconductivity in CaC6

et al. 2012

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We study the graphite intercalated compound CaC6 by means of Eliashberg theory. We perform an analysis of the electron-phonon coupling and define a minimal 6-band anisotropic structure, that leads to a Fermi surface dependance of the superconducting gap. A comparison of the superconducting gap structure obtained using the Eliashberg and the superconducting density functional theory is performed. We further report the anisotropic properties of the electronic spectral function, the polaronic quasi-particle branches and their interplay with Bogoljubov excitations.

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“…Elucidation of the nature of the superconducting state in the newly discovered CaC 6 compound [1,2] with T C at 11.5 K is of importance both for fundamental understanding and for applied research. Two relevant issues are the nature of the superconducting pairing mechanism and the symmetry of the order parameter.…”

Section: Introductionmentioning

confidence: 99%

Microwave losses of bulk CaC6

Cifariello¹,

Gennaro²,

Lamura³

et al. 2007

Physica C: Superconductivity and its Applications

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We report a study of the temperature dependence of the surface resistance R S in the graphite intercalated compound (GIC) CaC 6 , where superconductivity at 11.5 K was recently discovered. Experiments are carried out using a copper dielectrically loaded cavity operating at 7 GHz in a "hot finger" configuration. Bulk CaC 6 samples have been synthesized from highly oriented pyrolytic graphite. Microwave data allows to extract unique information on the quasiparticle density and on the nature of pairing in superconductors. The analysis of R S (T) confirms our recent experimental findings that CaC 6 behaves as a weakly-coupled, fully gapped, superconductor.

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Superconductivity of BulkCaC6

Cited by 418 publications

References 15 publications

Charge density waves in the graphene sheets of the superconductor CaC6

Charge density waves in the graphene sheets of the superconductor CaC6

Phononic self-energy effects and superconductivity in CaC6

Microwave losses of bulk CaC6

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