Dynamical Spin Polarization of Excess Quasiparticles in Superconductors.

  title={Dynamical Spin Polarization of Excess Quasiparticles in Superconductors.},
  author={Julia S. Meyer and Manuel Houzet and Yuli V. Nazarov},
  journal={Physical review letters},
  volume={125 9},
We show that the annihilation dynamics of excess quasiparticles in superconductors may result in the spontaneous formation of large spin-polarized clusters. This presents a novel scenario for spontaneous spin polarization. We estimate the relevant scales for aluminum, finding the feasibility of clusters with total spin S≃10^{4}ℏ that could be spread over microns. The fluctuation dynamics of such large spins may be detected by measuring the flux noise in a loop hosting a cluster. 

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