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Updated: Oct 2, 2026

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Published on: August 2, 2019
Evidence for suppression of superconductivity by spin imbalance in Co-Al-Co single-electron transistors
C D Chen1, Watson Kuo, D S Chung
1Institute of Physics, Academia Sinica, Nankang 115, Taipei, Taiwan, Republic of China. chiidong@phys.sinica.edu.tw
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.
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