Superfluidity refers to a transition that occurs in the properties of liquid helium at a temperature of 2.17K, called the lambda point of helium. A discontinuity in heat capacity is observed, the density of the liquid is decreased, and a fraction of...

Superfluidity is a phase of matter or description of heat capacity in which "unusual" effects are observed when liquids, typically of helium-4 or helium-3, overcome friction by surface interaction when at a stage, known as the "lambda point" for...

Quantum swirls in superfluid helium At sufficiently low temperatures, liquid helium becomes a superfluid, flowing without friction. This curious property is one of the more startling consequences of the role quantum mechanics plays in determining the bulk properties of liquid helium. ...

Researchers have found evidence that helium-3 superfluid oscillates at a characteristic frequency in response to a slight difference in pressure. The phenomena, called the Josephson effect, forms the foundation of various electric devices including magnetic field detectors. For physicists probing the curious quantum...