Re-entrant spin susceptibility of a superconducting grain
Phys Rev Lett
; 84(3): 550-3, 2000 Jan 17.
Article
in En
| MEDLINE
| ID: mdl-11015961
ABSTRACT
We study the spin susceptibility chi of a small, isolated superconducting grain. Because of the interplay between parity effects and pairing correlations, the dependence of chi 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, chi 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, chi(T) is exponentially small at low temperatures.
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Collection:
01-internacional
Database:
MEDLINE
Language:
En
Journal:
Phys Rev Lett
Year:
2000
Type:
Article
Affiliation country:
Italy