Second viscosity of A(1)-phase of superfluid (3)He at low temperatures

• Published in: Physica. B, Condensed matter Vol. 405; no. 4; pp. 1050 - 1054
• Main Authors: Afzali, R, Rahmati, F
• Format: Journal Article
• Language: English
• Published: 15-02-2010
• ISSN: 0921-4526
• DOI: 10.1016/j.physb.2009.11.002

The second viscosity coefficients of A(1)-phase of superfluid (3)He are calculated at low temperatures and melting pressure by using the standard Boltzmann equation approach. The Pfitzner procedure has been used for the quasiparticle scattering amplitude which appears in collision integrals of Boltzmann equation. Temperature dependence of components of second viscosity coefficients, ([zeta](1))(xx)(=([zeta](1))(yy)), ([zeta](1))(zz) and ([zeta](2))(xx)(=([zeta](2))(yy)=([zeta] (2))(zz)) are proportional to ((s(2))([arrow up]))(2)T(6), ((s(2))([arrow up]))(2)T(4) and ((s(2))([arrow down]))(2)T(2), respectively, where the spin-dependent (s(2))([arrow down]) is found to be constant with respect to temperature, while (s(2))([arrow up]) has a 1/T(2) dependence. Therefore, ([zeta](1))(xx) and ([zeta](2))(xx) are proportional to T(2), and ([zeta](1))(zz) and the other viscosity coefficient [zeta](3) are constant.