ULVAC CRYOGENICS INC.

Japan

ULVAC CRYOGENICS INC.

Japan
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Saitoh M.,RIKEN | Saitoh M.,ULVAC CRYOGENICS INC. | Ikegami H.,RIKEN | Kono K.,RIKEN
Physical Review Letters | Year: 2016

We elucidate, for the first time, the overall behavior of the onset temperature of superfluidity in He3 films for a wide range of film thicknesses d between 0.06 and 10 μm by taking advantage of the tunability of d implemented using microfabricated devices. We observe a suppression of the onset temperature of superfluidity Tcf in a film from the bulk transition temperature as d decreases. In particular, Tcf is strongly suppressed when d approaches the coherence length (∼77 nm). The observed Tcf as a function of d is similar to that expected from the quasiclassical theory, but it unexpectedly deviates from the theoretical value by several percent when 0.5d5 μm. © 2016 American Physical Society.

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