Measurements performed on liquid 4He at five different pressures near the lambda line indicate that the viscosity η is singular at the transition. A description in terms of a confluent singularity gives an exponent with equal values at different pressures and on both sides of the superfluid transition. The measurements have been performed in the temperature range 10−5 < |1 − T/Tλ| < 10−2 and for pressures up to 25 atm.
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Work sponsored by Consiglio Nazionale delle Ricerche, Rome, Italy.
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Bruschi, L., Santini, M. The 4He viscosity near the superfluid transition under pressure. J Low Temp Phys 33, 357–368 (1978). https://doi.org/10.1007/BF00115005
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DOI: https://doi.org/10.1007/BF00115005