Reduction of Electron Repulsion and Enhancement of Tc in Small Diffusive Superconducting Grains
Sabyasachi Tarat, Yuval Oreg, Yoseph Imry
DOI 10.1103/PhysRevLett.118.157001 · Physical Review Letters
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Abstract
The superconducting properties of small metallic grains has been a topic of active research for half a century now. Early experiments demonstrated a remarkable rise in the critical temperature, Tc, with reducing grain size in a variety of materials. In two-dimensional diffusive superconductors, Tc is decreased due to enhanced Coulomb repulsion. We propose that in finite-size grains the diffusive enhancement of the Coulomb repulsion is weakened and leads ultimately to an increase in Tc in isolated, disordered two-dimensional grains. Our mechanism is superimposed on the possible enhancement in Tc due to the change in the density of states of finite-size systems.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| Al Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | — | Pressure not reported | unknown |
| Sn Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | — | Pressure not reported | unknown |
| In Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | — | Pressure not reported | unknown |
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