Pressure dependence of the superconducting transition temperature in C6Yb and C6Ca
Robert P. Smith, Anna Kusmartseva, Yuen T. C. Ko, Siddharth S. Saxena, Ana Akrap, László Forró, Mukul Laad, Thomas E. Weller, Mark Ellerby, Neal T. Skipper
DOI 10.1103/PhysRevB.74.024505 · Physical Review B
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Abstract
We have studied the evolution, with hydrostatic pressure, of the recently-discovered superconductivity in the graphite intercalation compounds C6Yb and C6Ca. 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 dTc∕dP=+0.37±0.01 and +0.50±0.05K∕GPa for C6Yb and C6Ca, respectively. The transition temperature in C6Yb, 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.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| C6Yb Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 6.5 | Pressure unresolved | unknown |
| C6Ca Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 11.5 | Pressure unresolved | unknown |
| C8K Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 0.15 | Pressure unresolved | unknown |
| C6Yb Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 7.1 | 1.8 GPa | unknown |
| C6Yb Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 7.1 | 1.8 GPa | unknown |
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