Abstract
The existence is discussed of a low temperature phase with “infinite susceptibility” in a Bose fluid in two dimensions and in thin films. In particular the high temperature approach to the relative phase transition is considered by a second-order theory based on the use of finite temperature Green functions. It is shown that the small momenta singularity of the momentum distribution present in the low temperature phase gives an anomalous contribution to the high-energy neutron scattering and its temperature dependence is very similar to the one expected in the case of scattering by a system with Bose-Einstein condensation and to the experimental data on bulk liquid4 He. It is suggested that4He in a porous medium with an appropriate statistical distribution of pore size has an intermediate phase, characterized by an “infinite susceptibility,” between the high temperature normal phase and the low temperature phase with Bose-Einstein condensation.
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Reatto, L. Bose fluid in restricted geometry: High-energy neutron scattering. J Low Temp Phys 2, 353–370 (1970). https://doi.org/10.1007/BF00652507
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DOI: https://doi.org/10.1007/BF00652507