title: Evidence for suppression of superconductivity by spin imbalance in Co-Al-Co single-electron transistors.
abstract: Spin imbalance can lead to suppression of superconductivity. We report the phenomena manifesting this effect under spin-polarized quasiparticle currents in ferromagnet-superconductor-ferromagnet single-electron transistors. The measured superconducting gap as a function of magnetic field reveals a dramatic decrease when the magnetizations of the two leads are misaligned. The effect of suppression increases with increasing source-drain voltage. A comparison with theoretical calculations is presented. This method may render it applicable to control superconductivity at low temperatures within low fields.
authors.affiliation: Institute of Physics, Academia Sinica, Nankang 115, Taipei, Taiwan, Republic of China. chiidong@phys.sinica.edu.tw
authors.forename: C D
authors.initials: CD
authors.lastname: Chen
authors.forename: Watson
authors.initials: W
authors.lastname: Kuo
authors.forename: D S
authors.initials: DS
authors.lastname: Chung
authors.forename: J H
authors.initials: JH
authors.lastname: Shyu
authors.forename: C S
authors.initials: CS
authors.lastname: Wu