Superconductors that do not expel magnetic flux

@inproceedings{Tanaka2018SuperconductorsTD,
  title={Superconductors that do not expel magnetic flux},
  author={Y. Tanaka and Hirotake Yamamori and Takashi Yanagisawa and Taichiro Nishio and Shunichi Arisawa},
  year={2018}
}
An ultrathin superconducting bilayer creates a coreless fractional vortex when only the second layer has a hole. The quantization is broken by the hole, and the normal core disappears. The magnetic flux is no longer confined near the normal core, and its density profile around the hole becomes similar to that of a crème caramel; the divergence of the magnetic flux density is truncated around the center. We propose basic design of a practical device to realize a coreless fractional vortex. 

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