Evidence for Suppression of Superconductivity by Spin Imbalance in Co-Al-Co single electron transistors

Details Evidence for Suppression of Superconductivity by Spin Imbalance in Co-Al-Co single electron transistors Evidence for Suppression of Superconductivity by Spin Imbalance in Co-Al-Co single electron transistors

2001-03-26

arxiv.org/abs/cond-mat/0103523v3

Physics

Condensed Matter

Superconductivity

4 pages, 4 figures

Scientific paper

10.1103/PhysRevLett.88.047004

Spin imbalance is predicted to lead to suppression of superconductivity. We report 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 in opposite orientations. The effect of suppression increases with increas-ing voltage but decreases at elevated temperatures. The possible explanations for these dependences are given. This method may render it applicable to control superconductivity at low temperatures and low fields.

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