A HeI-HeII Interface and Second Sound Shock Waves near the Superfluid Transition
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概要
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A HeI-HeII interface and second sound shock waves are examined in ^<4>He near the superfluid transition on the basis of a phenomenological time-dependent Ginzburg-Landau model. They are kink solutions of the equations. The former is induced by heat flow and has a structure similar to that of the interface in type I superconductors in a magnetic field. This interface exists when the fluid is inhomogeneous with some regions above the transition and others below the transition. It generally moves slowly and can be stopped for some special boundary conditions. In simple one-dimensional cases its motion is described by a scheme of a modified version of the Stefan problem. On the other hand, in superfluid states finite thermal disturbances can propagate as a shock wave. This paper is the first attempt to examine its properties fully in the nonlinear regime including the dissipation. Our theory can be used for aribitrary temperature discontinuity. As a by-product we calculate in Appendix A the dispersion and attenuation of the linear second sound modes in the presence of arbitrary thermal counterflow. We take into account a nonlinear coupling between the order parameter and the entropy in the free energy. This coupling, the so-called dissipative coupling, is indispensable for our problems. We also discuss in detail a transition from a normal fluid state to a coexisting state, which is predicted to be discontinuous sufficiently near the λ point.
- 理論物理学刊行会の論文
- 1985-03-20
著者
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Onuki Akira
Research Institute For Fundamental Physics Kyoto University
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ONUKI Akira
Research Institute for Fundamental Physics, Kyoto University
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