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Pressure dependence of the superconducting transition temperature in C6Yb and C6Ca

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posted on 2015-04-24, 14:09 authored by Robert P. Smith, Anna KusmartsevaAnna Kusmartseva, Yuen T.C. Ko, Siddharth S. Saxena, Ana Akrap, Laszlo Forro, Mukul S. Laad, Thomas E. Weller, Mark Ellerby, Neal T. Skipper
We have studied the evolution, with hydrostatic pressure, of the recently-discovered superconductivity in the graphite intercalation compounds C 6 Yb and C 6 Ca . We present pressure-temperature phase diagrams, for both superconductors, established by electrical transport and magnetization measurements. In the range 0–1.2GPa the superconducting transition temperature increases linearly with pressure in both materials with dT c ∕dP=+0.37±0.01 and +0.50±0.05K∕GPa for C 6 Yb and C 6 Ca , respectively. The transition temperature in C 6 Yb , which has been measured up to 2.3GPa , reaches a peak at around 1.8GPa and then starts to drop. We also discuss how this pressure dependence may be explained within a plasmon pairing mechanism.

Funding

We would like to thank the EPSRC and Jesus and St. Catharine’s Colleges of the University of Cambridge for financial support.

History

School

  • Science

Department

  • Physics

Published in

PHYSICAL REVIEW B

Volume

74

Issue

2

Pages

? - ? (4)

Citation

SMITH, R.P. ... et al, 2006. Pressure dependence of the superconducting transition temperature in C6Yb and C6Ca. Physical Review B - Condensed Matter and Materials Physics, 74 (2), 024505.

Publisher

© American Physical Society

Version

  • VoR (Version of Record)

Publisher statement

This work is made available according to the conditions of the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International (CC BY-NC-ND 4.0) licence. Full details of this licence are available at: https://creativecommons.org/licenses/by-nc-nd/4.0/

Publication date

2006

Notes

This article was published in the journal, Physical Review B [© American Physical Society]. It is also available at: http://dx.doi.org/10.1103/PhysRevB.74.024505

ISSN

1098-0121

Language

  • en

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