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Journal Article

Effect of pressure on superconducting Ca-intercalated graphite CaC6

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 Research Groups, Max Planck Institute for Solid State Research, Max Planck Society;
Former Departments, 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/persons280185

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

/persons/resource/persons280420

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

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Citation

Kim, J. S., Boeri, L., Kremer, R. K., & Razavi, F. S. (2006). Effect of pressure on superconducting Ca-intercalated graphite CaC6. Physical Review B, 74(21): 214513.


Cite as: https://hdl.handle.net/21.11116/0000-000E-FD08-D
Abstract
The effect of pressure on the superconducting transition temperature
(T-c) of the Ca-intercalated graphite compound CaC6 has been
investigated up to similar to 16 kbar. T-c is found to increase under
pressure with a large relative ratio Delta T-c/T-c of approximate to
0.4%/kbar. Using first-principles calculations, we show that the
positive effect of pressure on T-c can be explained within the scope of
electron-phonon theory due to the presence of a soft phonon branch
associated with in-plane vibrations of the Ca atoms. The implications
of the present findings for the current debate about the
superconducting mechanism in graphite intercalation compounds are
discussed.