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  Effect of pressure on superconducting Ca-intercalated graphite CaC6

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.

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 Creators:
Kim, J. S.1, Author           
Boeri, L.2, 3, 4, Author           
Kremer, R. K.1, Author           
Razavi, F. S.1, 5, Author           
Affiliations:
1Former Scientific Facilities, Max Planck Institute for Solid State Research, Max Planck Society, ou_3370501              
2Former Research Groups, Max Planck Institute for Solid State Research, Max Planck Society, ou_3370500              
3Former Departments, Max Planck Institute for Solid State Research, Max Planck Society, ou_3370502              
4Department Solid State Spectroscopy (Bernhard Keimer), Max Planck Institute for Solid State Research, Max Planck Society, ou_3370480              
5Scientific Facility Thin Film Technology (Gennady Logvenov), Max Planck Institute for Solid State Research, Max Planck Society, ou_3370497              

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 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.

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Language(s): eng - English
 Dates: 2006
 Publication Status: Issued
 Pages: -
 Publishing info: -
 Table of Contents: -
 Rev. Type: Peer
 Identifiers: eDoc: 306067
ISI: 000243195500093
 Degree: -

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Title: Physical Review B
Source Genre: Journal
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Publ. Info: -
Pages: - Volume / Issue: 74 (21) Sequence Number: 214513 Start / End Page: - Identifier: ISSN: 1098-0121