Superconductivity in Graphitic Compounds

Hannay, N. B.; Geballe, T. H.; Matthias, B. T.; Andres, K.; Schmidt, P.; MacNair, D.

doi:10.1103/physrevlett.14.225

Cited by 510 publications

(277 citation statements)

References 4 publications

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“…Intercalated graphites and similar materials When discussing superconductivity in graphene-like systems, we should probably also mention that superconductivity has been long established in alkali metal intercalated graphites [157,158,159] and, more recently, also in the few-layer versions of such systems [26]. The alkali atom intercalated graphites are phonon-driven s-wave superconductors with CaC 6 reaching the highest transition temperature at 11.6 K. The pairing has been associated with the interlayer bands that mainly reside on the intercalated metals and thus this is likely not related to intrinsic superconductivity in graphite [160].…”

Section: Graphene-like Systemsmentioning

confidence: 99%

Chirald-wave superconductivity in doped graphene

Black‐Schaffer

Honerkamp

2014

J. Phys.: Condens. Matter

177

176

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Abstract. A highly unconventional superconducting state with a spin-singlet d x 2 −y 2 ± id xy -wave, or chiral d-wave, symmetry has recently been proposed to emerge from electron-electron interactions in doped graphene. Especially graphene doped to the van Hove singularity at 1/4 doping, where the density of states diverges, has been argued to likely be a chiral d-wave superconductor. In this review we summarize the currently mounting theoretical evidence for the existence of a chiral d-wave superconducting state in graphene, obtained with methods ranging from mean-field studies of effective Hamiltonians to angle-resolved renormalization group calculations. We further discuss multiple distinctive properties of the chiral d-wave superconducting state in graphene, as well as its stability in the presence of disorder. We also review means of enhancing the chiral d-wave state using proximity-induced superconductivity. The appearance of chiral d-wave superconductivity is intimately linked to the hexagonal crystal lattice and we also offer a brief overview of other materials which have also been proposed to be chiral d-wave superconductors.

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Section: Graphene-like Systemsmentioning

confidence: 99%

Chirald-wave superconductivity in doped graphene

Black‐Schaffer

Honerkamp

2014

J. Phys.: Condens. Matter

177

176

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“…Since the discovery of the first graphite intercalate superconductor, KC8 [18,23], many other GICs have been made and found to be superconducting. Tables 1 and 2 intercalates.…”

Section: Superconductivitymentioning

confidence: 99%

Superconductivity in graphite intercalation compounds

Smith

Weller

Howard

et al. 2015

Physica C: Superconductivity and its Applications

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The field of superconductivity in the class of materials known as graphite intercalation compounds has a history dating back to the 1960s [1,2]. This paper recontextualizes the field in light of the discovery of superconductivity in CaC6 and YbC6 in 2005. In what follows, we outline the crystal structure and electronic structure of these and related compounds. We go on to experiments addressing the superconducting energy gap, lattice dynamics, pressure dependence, and how this relates to theoretical studies. The bulk of the evidence strongly supports a BCS superconducting state. However, important questions remain regarding which electronic states and phonon modes are most important for superconductivity and whether current theoretical techniques can fully describe the dependence of the superconducting transition temperature on pressure and chemical composition.Corresponding author. Tel: +44 (0)7792954220 fax: +44 (0)20 7679 7145 e-mail address: mark.ellerby@ucl.ac.uk (Mark Ellerby).

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“…The ground states of graphitic materials can be metallic, semi-metallic or semiconducting, depending on the allotrope form or intercalated species, and some have even been shown to superconduct 2,3 with transition temperatures (T c ) above 10 K (ref. 4,5).…”

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confidence: 99%

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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Superconductivity in Graphitic Compounds

Cited by 510 publications

References 4 publications

Chirald-wave superconductivity in doped graphene

Chirald-wave superconductivity in doped graphene

Superconductivity in graphite intercalation compounds

Charge density waves in the graphene sheets of the superconductor CaC6

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