Re-entrant spin susceptibility of a superconducting grain

Details Re-entrant spin susceptibility of a superconducting grain Re-entrant spin susceptibility of a superconducting grain

1999-11-25

arxiv.org/abs/cond-mat/9911413v1

Phys. Rev. Letters, 84, 550 (2000).

Physics

Condensed Matter

Strongly Correlated Electrons

9 pages, 3 figures. To be published in PRL

Scientific paper

10.1103/PhysRevLett.84.550

We study the spin susceptibility chi of a small, isolated superconducting grain. Due to 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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