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SYSF: Superfluidity

SYSF 1: Superfluidity 1

SYSF 1.2: Hauptvortrag

Montag, 27. März 2006, 10:15–10:45, HSZ 04

Disorder determined phase of the p-wave superfluid 3He — •Igor Fomin — P. L. Kapitza Institute for Physical Problems, Kosygina 2, 119334 Moscow, Russia

For p-wave Cooper pairing several superfluid phases can exist. Two pases - ABM and BW are realized in the superfluid 3He. The order parameters of both phases are minima of the conventional Ginzburg and Landau free energy, obtained as a regular expansion in powers of the order parameter. Introduction of impurities in a form of high porosity aerogels in the superfluid 3He changes expression for its free energy. Singular terms appear in this expression. The singular terms dominate in a near vicinity of the transition temperature. As a result new phase can appear at cooling of liquid 3He from the normal phase in the superfluid. The order parameter of the new quasi-isotropic, or No-dqrobustNo-dq phase is found and suggested as a candidate for the experimentally observed A-like phase. Some properties of the suggested phase are discussed.