ar X iv : c on d - m at / 0 60 56 80 v 1 [ co nd - m at . o th er ] 2 7 M ay 2 00 6 Supersolid helium at high pressure
نویسنده
چکیده
Recently we reported the observation of superfluidity in solid He confined inside porous Vycor glass with characteristic pore diameter of 7 nm [1], porous gold with pore diameter of 490 nm [2] and also in bulk solid He [3]. In the bulk experiment solid helium is confined in an annular channel inside the torsion bob (see inset III of Fig.1). The width, depth and outer diameter of the channel are respectively 0.63 mm, 5 mm, and 10 mm. The torsion bob is driven and maintained at a resonant period of 1,096,465 ns with a mechanical quality factor (Q) of 2× 10 by a pair of electrodes. When the torsional oscillator is cooled below 230 mK the resonant period (which is proportional to the squared-root of the moment of inertia, I, of the torsion bob) shows an abrupt drop from the expected, linearly extrapolated value from higher temperatures. The most simple explanation of the decrease in I, considering the various control experiments that were carried out, is the onset of nonclassical rotational inertia (NCRI) or superfluidity in solid He [4].
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