The λ-Phenomenon of Liquid Helium and the Bose-Einstein Degeneracy

@article{London1938TheO,
  title={The $\lambda$-Phenomenon of Liquid Helium and the Bose-Einstein Degeneracy},
  author={Fritz London},
  journal={Nature},
  year={1938},
  volume={141},
  pages={643-644}
}
IN a recent paper1 Fröhlich has tried to interpret the λ-phenomenon of liquid helium as an order–disorder transition between n holes and n helium atoms in a body-centred cubic lattice of 2n places. He remarks that a body-centred cubic lattice may be considered as consisting of two shifted diamond lattices, and he assumes that below the λ-point the helium atoms prefer the places of one of the two diamond lattices. The transition is treated on the lines of the Bragg-Williams-Bethe theory as a… 

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