Spin Pumping Effect in Superfluid 3He A1

Spin fluid dynamics observed by magnetic fountain effect and mechanical spin pumping effect in the ferromagnetic superfluidH3eA1Aoki1, Yamaguchi2, Suzuki3 et al. 2010Phys. Rev. BSelf Cite3000View full textAdd to dashboardCite

“…The extracted T 1 decreases monotonically as the temperature is lowered and tends to vanish at T C2 . This behavior is unexpected for a totally ferromagnetic superfluid A 1 phase but is consistent with the A 1 phase containing a small amount of minority spin pair condensate [13]. The presence of minority condensate is in agreement also with the theoretical predictions of Monien and Tewordt [14].…”

“…Since τ n remains finite at all temperatures, the observed tendency of τ to vanish at T C2 implies that T 1 also tends to vanish there. This surprising finding was interpreted previously [13] as a consequence of the presence of a minority spin condensate in the A 1 phase. The data acquired using the improved apparatus are carefully analyzed and their interpretation in terms of a model involving a minority spin condensate is reexamined.…”

“…We demonstrated that temperature gradients had been present in our previous magnetic fountain effect (MFE) experiments [13] and that these gradients had influenced data in the ferromagnetic superfluid 3 He A 1 phase. The work presented here was motivated by the goal of eliminating these temperature gradients.…”

“…2 of Ref. [13]) in its temperature dependence as T C2 was approached. Since establishing the intrinsic temperature dependence of τ is very important and it may affect our conclusion on the existence of a minority spin condensate, it is imperative to investigate the kink in the temperature dependence of τ .…”

“…To study the possibility of a thermal gradient across the superleak as the source of the observed kink in τ , a new apparatus was constructed in an essentially identical manner to the previous one [13] using the epoxy Stycast 1266 as the construction material (see below). In addition two vibrating wire viscometer thermometers were installed; one in the detector chamber and the other in the reservoir [17].…”