Anomalous Suppression of Superfluidity in ${}^4$He Confined in a Nano-porous Glass: Possible Quantum Phase Transition

K. Yamamoto, H. Nakashima, Y. Shibayama +1

We explore superfluidity for ${}^4$He 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 d…