Low‐temperature physics owes its existence to liquid helium, the refrigerant that permits investigation of phenomena occurring at a few degrees Kelvin. But liquid helium is fascinating in its own right, and the goal of understanding its “superfluidity” below 2.17 K has stimulated both experimenters and theorists.
Quantum nature of superfluid helium
Seth J. Putterman, Isadore Rudnick; Quantum nature of superfluid helium. Physics Today 1 August 1971; 24 (8): 39–47. https://doi.org/10.1063/1.3022882
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