Parity-Affected Superconductivity in Ultrasmall Metallic Grains
Jan von Delft, Andrei D. Zaikin, Dmitrii S. Golubev, Wolfgang Tichy
DOI 10.1103/PhysRevLett.77.3189 · Physical Review Letters
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Abstract
We investigate the breakdown of BCS superconductivity in ultrasmall metallic grains as a function of particle size (characterized by the mean spacing d between discrete electronic eigenstates), and the parity ( P=even/odd) of the number of electrons on the island. Assuming equally spaced levels, we solve the parity-dependent BCS gap equation for the pairing parameter ΔP(d,T). The T=0 critical level spacing dc,P, the critical temperature Tc,P(d) (at which ΔP=0), and the condensation energy EP are parity dependent, and all are so much smaller in the odd than the even case that this should manifest itself in current experiments.
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. | 0.18 | Pressure not reported | unknown |
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