Anomalous suppression of superfluidity in 4He confined in a nanoporous glass.
We explore the superfluidity of 4He confined in a porous glass, which has nanopores of 2.5 nm in diameter, at pressures up to 5 MPa. With increasing pressure, the superfluidity is drastically suppressed, and the superfluid transition temperature approaches 0 K at some critical pressure, Pc approximately 3.4 MPa. The feature suggests that the extreme confinement of 4He into the nanopores induces a quantum phase transition from a superfluid to a nonsuperfluid at 0 K and at Pc.
Department of Physics, Keio University, Yokohama 223-8522, Japan.
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Yamamoto
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Nakashima
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Shibayama
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Shirahama