Anomalous Suppression of Superfluidity in 4He Confined in a Nano-porous Glass: Possible Quantum Phase Transition
Abstract
We explore superfluidity for 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 Pc = 3.5 MPa. The features strongly suggest that the extreme confinement of 4He into the nanopores induces a quantum phase transition from superfluid to nonsuperfluid at 0 K, and at Pc.
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