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Physics Colloquium, March 8, 2005Can a solid be superfluid?Moses H. W. ChanPenn State UniversityOur recent experiments found evidence that answers the question in the surprising affirmative. I will report on the observation of non-classical rotational inertia in solid He-4 confined to an annular channel in a sample cell under torsional motion, demonstrating superfluid behavior. Measurements on solid samples at different pressures (and hence different densities) allow us to map out the phase boundary of this supersolid. These counterintuitive results indicate that superfluid behavior is found in all three phases of matter; gas, liquid and solid. This work is carried out in collaboration with Eunseong Kim and it is supported by the National Science Foundation of US. 3.30 p.m., Smith Laboratory, Room 1005Refreshments served in Smith 1094 at 3:00 p.m. |
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