For 10 points, name these substances like super cold helium-3, which lack any viscosity below a certain temperature
A criterion for stability in these substances states that their relative velocity must be less than the minimum velocity needed to induce an elementary excitation. A form of these substances has the unusual property that it's one particle density matrix does vanish as distances go to infinity; that property is called off-diagonal long-range order, which allows these substances to undergo Bose-Einstein condensation. Osheroff managed to create one of these substances from a bunch of bosons by using a method named for (*) Pomeranchuk. Graphing the specific heat capacity versus temperature for one of these substances shows a discontinuity at a critical temperature, and rotating these substances quickly forms quantized vortices. These substances form Rollin films on the walls of their containers and exist below the lambda point. For 10 points, name these substances like super cold helium-3, which lack any viscosity below a certain temperature
A criterion for stability in these substances states that their relative velocity must be less than the minimum velocity needed to induce an elementary excitation.
superfluids