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A substance that reaches superconductivity, a state in which magnetic fields cannot penetrate, and there is no electrical resistance, is referred to as a superconductor. In 1911, Heike Kamerlingh Onnes of Leiden University, a Dutch physicist, observed a relation between the temperature and the resistance of the element mercury. The mercury sample was then cooled in liquid helium to study the linear dependence of resistance on temperature. It was observed that, as the temperature decreased, the...

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Superconductivity in heavy alkaline-Earth intercalated graphites.

J S Kim¹, L Boeri, J R O'Brien

¹Max-Planck-Institut für Festkörperforschung, Heisenbergstrasse 1, D-70569 Stuttgart, Germany.

Physical Review Letters

|August 7, 2007

Summary

Superconductivity was discovered in strontium-intercalated graphite (SrC6) at 1.65 K. This finding, along with reduced anisotropy and an anisotropic gap, offers new insights into superconducting materials.

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Area of Science:

Materials Science
Condensed Matter Physics
Superconductivity

Background:

Alkaline earth metal-intercalated graphite compounds (AeC6) are known superconductors.
Calcium-intercalated graphite (CaC6) exhibits superconductivity with anisotropic properties.

Purpose of the Study:

To investigate the superconducting properties of strontium-intercalated graphite (SrC6).
To compare the superconductivity of SrC6 with CaC6 and understand the factors influencing critical temperature (Tc).

Main Methods:

Magnetic susceptibility measurements.
Specific heat (Cp) measurements.
Analysis of upper critical fields and superconducting gap anisotropy.

Main Results:

Superconductivity was observed in SrC6 below 1.65(6) K.
SrC6 showed significantly reduced anisotropy in upper critical fields compared to CaC6.
The specific heat anomaly at Tc was smaller than BCS predictions, indicating an anisotropic superconducting gap.

Conclusions:

The lower Tc in SrC6, compared to CaC6, is attributed to "negative" pressure effects reducing electron-phonon coupling.
SrC6 exhibits an anisotropic superconducting gap, similar to CaC6.
No superconductivity was observed in BaC6 down to 0.3 K.