title: Magnetic response of disordered metallic rings: large contribution of far levels.
abstract: We calculate the orbital linear magnetic response of disordered metallic rings to an Aharonov-Bohm flux using the BCS model for attractive electron-electron interaction. The contribution of all levels including those up to a high energy cutoff results in a much larger value than previously obtained using the local interaction model. The possible relevance of our results to the resolution of the discrepancy between the experimental and theoretical values for the ensemble-averaged persistent currents in these systems is discussed.
authors.affiliation: The Racah Institute of Physics, Hebrew University, Jerusalem 91904, Israel.
authors.forename: M
authors.initials: M
authors.lastname: Schechter
authors.forename: Y
authors.initials: Y
authors.lastname: Oreg
authors.forename: Y
authors.initials: Y
authors.lastname: Imry
authors.forename: Y
authors.initials: Y
authors.lastname: Levinson