Theory of helium under heat flow near the ? point. II. Dynamics of phase change

Enhanced Heat Capacity and a New Temperature Instability in SuperfluidH4ein the Presence of a Constant Heat Flux NearHarter1, Lee2, Chatto3 et al. 2000Phys. Rev. Lett.24170View full textAdd to dashboardCite

“…In summary, we conclude that the breakdown of superfluidity in our cell, previously observed by DAS and others, is a boundary effect, quite distinct from the physics treated by recent theories [1][2][3][9][10][11]13]. It should be possible to devise experiments to test this hypothesis.…”

“…Theories [9,10,13] give x 1͞2n 0.746 where n is the correlation length exponent. Haussman and Dohm (HD) applied renormalization-group theory to the problem and found Q 0 7395 W͞cm 2 [11], although Haussmann recently modified this prediction to be 6571 W͞cm 2 [ 3 ].…”

Depression of the superfluid transition temperature inHe4by a heat current

“…8 Theoretical discussions of this effect have been presented by several authors. 5,6 As noted above, the phenomenon is somewhat analogous to the depression of the transition temperature in a superconductor by an electric current or a magnetic field. 6 However, the fluctuations, which are important in the helium case but not in the superconductor, initially have been neglected in the theory.…”

“…5,6 As noted above, the phenomenon is somewhat analogous to the depression of the transition temperature in a superconductor by an electric current or a magnetic field. 6 However, the fluctuations, which are important in the helium case but not in the superconductor, initially have been neglected in the theory. 5 ' 6 An attempt has been made to include their effect a posteriori by use of scaling arguments and known values for the correlation length and the thermal conductivity.…”

“…6 However, the fluctuations, which are important in the helium case but not in the superconductor, initially have been neglected in the theory. 5 ' 6 An attempt has been made to include their effect a posteriori by use of scaling arguments and known values for the correlation length and the thermal conductivity. 6 As we shall see, this approach has yielded a remarkably accurate prediction; but a more fundamental treatment which includes the fluctuations at the beginning would nontheless be desirable.…”