Fluctuations of mass and spin currents and the superfluidity of 3He

We use the equations of Landau’s theory extended to the case of arbitrary momentum transfer to derive an effective hamiltonian of a Fermi liquid. As applied to 3He the exchange of fluctuations in the particle and spin current densities is responsible for the effective attraction and formation of Cooper pairs with l = 1. We show that in the local response approximation fluctuations in the spin current can be the origin of the preference for the A phase over the B phase. We calculate the pressure dependence of the Landau parameter Z1.

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