Re-entrant spin susceptibility of a superconducting grain
Strongly Correlated Electrons
2007-05-23 v1 Mesoscale and Nanoscale Physics
Abstract
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.
Cite
@article{arxiv.cond-mat/9911413,
title = {Re-entrant spin susceptibility of a superconducting grain},
author = {A. Di Lorenzo and Rosario Fazio and F. W. J. Hekking and G. Falci and A. Mastellone and G. Giaquinta},
journal= {arXiv preprint arXiv:cond-mat/9911413},
year = {2007}
}
Comments
9 pages, 3 figures. To be published in PRL