3He low temperature viscosity

Shear viscosity of superfluid 3He–A1 at low temperatures

“…where we employ the fact that at low temperature all momenta lie on the Fermi surface. T from [19], F v from [28], and m m * from [29], we get ( )…”

“…The shear viscosity, in the presence of low magnetic field, has been measured by Alvesalo et al [16]. A number of viscosity measurements have been carried out in the A 1 and A 2 phases of superfluid He 3 at different high magnetic fields by Roobol et al [18][19][20]. All the results show a sharp decrease proportional to the opening of the superfluid energy gap, ∆ ∝ ( 1-T/T c ) T and goes as 2…”

Shear viscosity of the A1-phase of superfluid3He

“…where i = 1, 2, 3 and 4 stands for both momentum ( P i ) and spin (σ i ) variables. By using (1) in (3) the interaction between quasiparticles in the A 1 -phase of superfluid is…”

“…The viscosity of the A 1 -phase of superfluid 3 He is investigated at temperatures close to the transition temperature, T c1 , where the maximum gap in the excitation spectrum is small in comparison with the thermal energy k B T . It is supposed that in the A 1 -phase only spin-up pairs exist, since it follows from the free energy expression that below the transition temperature, T c1 , it is lowered by formation of spin-up pairs.…”

“…A number of viscosity measurements have been carried out in the A 1 and A 2 phases of superfluid 3 He at different high magnetic fields [2,3]. The previous viscosity measurements were determined in low magnetic fields [4].…”