Evidence for Suppression of Superconductivity by Spin Imbalance in Co-Al-Co Single-Electron Transistors

C. D. Chen, Watson Kuo, D. S. Chung, J. H. Shyu, C. S. Wu, Watson Kuo, J. H. Shyu

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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.

Original languageEnglish
Number of pages1
JournalPhysical Review Letters
Issue number4
Publication statusPublished - 2002 Jan 1


All Science Journal Classification (ASJC) codes

  • Physics and Astronomy(all)

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