# 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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The properties of helium at very low temperatures have recently been the subject of many investigations. Helium is the only substance which cannot be transformed into the solid state merely by
THE recently published measurements1 on some properties of condensed helium, in conjunction with the facts known from the work of Keesom and his co-workers2, allow us to draw some conclusions on the
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Nature
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SINCE publishing the preliminary measurements on thermal conduction in liquid helium II1 which showed a variation of conductivity with temperature gradient, further data have been collected