Superconductivity in Graphite Intercalation Compounds
Anisotropic superconductivity has been observed in a variety of layered materials including deliberately structured materials,1 transition metal dichalcogenides intercalated with large organic molecules,2 and graphite intercalation compounds (GICs). Because of the long range of the superconducting coherence distance ξ, the observation of 2D superconductivity focuses on samples with superlattice repeat distances I c large compared with the superconducting coherence distance to achieve the condition I c > ξ. Molecular beam epitaxy and magnetron sputtering offer the greatest promise for quantitative studies of 2D superconductivity and the 2D–3D crossover because of the flexibility of these synthesis techniques for the generation and control of large superlattice repeat distances in deliberately structured superconductors.1 Historically, early work on this subject was carried out with transition metal dichalcogenides intercalated with large organic molecules, where repeat distances of I c ≈ 60 Å were achieved for example by intercalation of n-octadecylamine into TaS2.3 Though intercalate repeat distances greater than the superconducting coherence length have not yet been achieved in GICs, the superconducting GICs have nevertheless provided an interesting system for the study of anisotropic superconductivity phenomena. In this paper, we briefly review superconductivity in GICs and provide some comparison with anisotropic superconducting behavior in deliberately structured materials and intercalated transition metal dichalcogenides.
KeywordsCritical Field Intercalation Compound Repeat Distance Super Lattice Graphite Intercalation Compound
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