Re-Entrant Spin Susceptibility of a Superconducting Grain
A. Di Lorenzo, Rosario Fazio, F. W. J. Hekking, G. Falci, A. Mastellone, G. Giaquinta
DOI 10.1103/PhysRevLett.84.550 · Physical Review Letters
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Abstract
We study the spin susceptibility χ of a small, isolated superconducting grain. Because of the interplay between parity effects and pairing correlations, the dependence of χ on temperature T is qualitatively different from the standard BCS result valid in the bulk limit. If the number of electrons on the grain is odd, χ shows a re-entrant behavior as a function of temperature. This behavior persists even in the case of ultrasmall grains where the mean level spacing is much larger than the BCS gap. If the number of electrons is even, χ(T) is exponentially small at low temperatures.
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 |
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