posted on 2015-04-24, 14:09authored byRobert 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.
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