Supersolid helium at high pressure.
We have measured the pressure dependence of the supersolid fraction by a torsional oscillator technique. Superflow is found from 25.6 bar up to 136.9 bar. The supersolid fraction in the low temperature limit increases from 0.6% at 25.6 bar near the melting boundary up to a maximum of 1.5% near 55 bar before showing a monotonic decrease with pressure extrapolating to zero near 170 bar.
Kim
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Department of Physics, the Pennsylvania State University, University Park, Pennsylvania 16802, USA. eunseong@kaist.ac.kr
Chan
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