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Résumé |
Liquid He-4 enters into a superfluid state and flows without any friction below 2.176K. Recent torsional oscillator measurements of solid helium confined in porous media and in bulk form in a number of laboratories found superfluid-like behavior, specifically a decrease in the rotational inertia of the solid below 0.2K. Interestingly, measurements at Alberta and ENS found the shear modulus of the solid exhibit temperature dependence mirrors this non-classical rotational inertia (NCRI) behavior. A specific heat peak at the expected temperature was also found. The microscopic origin and physical interpretation of the observed phenomena is still a subject of intrigue and puzzlement. |
