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Journal Article

Superconductivity in Heavy Alkaline-Earth Intercalated Graphites

MPS-Authors
/persons/resource/persons280144

Kim,  J. S.
Former Scientific Facilities, Max Planck Institute for Solid State Research, Max Planck Society;

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Boeri,  L.
Former Departments, Max Planck Institute for Solid State Research, Max Planck Society;
Former Research Groups, Max Planck Institute for Solid State Research, Max Planck Society;
Department Solid State Spectroscopy (Bernhard Keimer), Max Planck Institute for Solid State Research, Max Planck Society;

/persons/resource/persons280420

Razavi,  F. S.
Scientific Facility Thin Film Technology (Gennady Logvenov), Max Planck Institute for Solid State Research, Max Planck Society;
Former Scientific Facilities, Max Planck Institute for Solid State Research, Max Planck Society;

/persons/resource/persons280185

Kremer,  R. K.
Former Scientific Facilities, Max Planck Institute for Solid State Research, Max Planck Society;

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Citation

Kim, J. S., Boeri, L., O'Brien, J. R., Razavi, F. S., & Kremer, R. K. (2007). Superconductivity in Heavy Alkaline-Earth Intercalated Graphites. Physical Review Letters, 99(2): 027001.


Cite as: https://hdl.handle.net/21.11116/0000-000E-B50A-B
Abstract
We report the discovery of superconductivity below 1.65(6) K in Sr-intercalated graphite SrC6, by susceptibility and specific heat (C-p) measurements. In comparison with CaC6, we found that the anisotropy of the upper critical fields for SrC6 is much reduced. The C-p anomaly at T-c is smaller than the BCS prediction, indicating an anisotropic superconducting gap for SrC6 similar to CaC6. The significantly lower T-c of SrC6 as compared to CaC6 can be understood in terms of "negative" pressure effects, which decreases the electron-phonon coupling for both in-plane intercalant and the out-of-plane C phonon modes. We observed no superconductivity for BaC6 down to 0.3 K.