Superconducting fluctuations in small grains - the Universal Hamiltonian and the reduced BCS model

Details Superconducting fluctuations in small grains - the Universal Hamiltonian and the reduced BCS model Superconducting fluctuations in small grains - the Universal Hamiltonian and the reduced BCS model

2007-08-09

arxiv.org/abs/0708.1339v1

Physica C 468, 350 (2008)

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

Contribution to the proceedings of "Fluctuations and phase transitions in superconductors", Nazareth Ilit, Israel, June 10-14,

Scientific paper

10.1016/j.physc.2007.08.025

Small superconducting grains are discussed in the frameworks of both the reduced BCS Hamiltonian and the Universal Hamiltonian. It is shown that fluctuations of electrons in levels far from the Fermi energy dominate superconducting properties in small and ultrasmall grains. Experimental consequences related to the spin susceptibility and persistent currents of grains and rings with weak electron-electron interactions are discussed.

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