TY - JOUR
T1 - Torsional oscillator experiment on superfluid 4He confined in a porous alumina nanopore array
AU - Murakawa, S.
AU - Higashino, R.
AU - Yoshimura, K.
AU - Chikazawa, Y.
AU - Tanaka, T.
AU - Kuriyama, K.
AU - Honda, K.
AU - Shibayama, Y.
AU - Shirahama, K.
PY - 2012
Y1 - 2012
N2 - We studied superfluidity of liquid 4He confined in an array of well-characterized straight nanopores of porous alumina (PA). The PA plate sample of 45 nm pore size is set in an annular flow channel and the superflow is detected by torsional oscillator (TO) technique. Superfluid transition T c in the nanopores is suppressed by 3.5 mK from the bulk λ point. Tc is consistent with the temperature at which the healing length is equal to the pore radius. We have observed many anti-crossing anomalies in the TO frequency associated with dissipation peaks, which are attributed to the coupling to second sound resonances.
AB - We studied superfluidity of liquid 4He confined in an array of well-characterized straight nanopores of porous alumina (PA). The PA plate sample of 45 nm pore size is set in an annular flow channel and the superflow is detected by torsional oscillator (TO) technique. Superfluid transition T c in the nanopores is suppressed by 3.5 mK from the bulk λ point. Tc is consistent with the temperature at which the healing length is equal to the pore radius. We have observed many anti-crossing anomalies in the TO frequency associated with dissipation peaks, which are attributed to the coupling to second sound resonances.
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U2 - 10.1088/1742-6596/400/1/012053
DO - 10.1088/1742-6596/400/1/012053
M3 - Conference article
AN - SCOPUS:84873689459
SN - 1742-6588
VL - 400
JO - Journal of Physics: Conference Series
JF - Journal of Physics: Conference Series
IS - PART 1
M1 - 012053
T2 - 26th International Conference on Low Temperature Physics, LT 2011
Y2 - 10 August 2011 through 17 August 2011
ER -