V. V. Dmitriev, V. V. Zav'yalov, D. E. Zmeev, I. V. Kosarev, N. Mulders, “Nonlinear NMR in a superfluid B phase of <nobr>$^3$</nobr>He in aerogel”, Pis'ma v Zh. Èksper. Teoret. Fiz., 2002, Volume 76, Issue 5,Pages <nobr>371

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CONDENSED MATTER

Nonlinear NMR in a superfluid B phase of $^3$He in aerogel

V. V. Dmitriev^a, V. V. Zav'yalov^a, D. E. Zmeev^a, I. V. Kosarev^a, N. Mulders^b

^a P. L. Kapitza Institute for Physical Problems, Russian Academy of Sciences, Moscow
^b Department of Physics and Astronomy, University of Delaware

Abstract: he properties of liquid $^3$He in a low-density aerogel preliminarily covered with a few monolayers of $^4$He were studied by pulsed and nonlinear CW NMR techniques. It was found that an NMR frequency shift from the Larmor value exhibits a sharp increase at a magnetization tilting angle exceeding $104^\circ$. Nonlinear CW NMR signals related to the formation of a macroscopic region featuring homogeneous precession of the magnetization (homogeneous precession domain) were observed. The experimental results confirm that the low-temperature superfluid $^3$He phase in the aerogel is analogous to the B-phase in bulk $^3$He and indicate that the spin supercurrents play an important role in the spin dynamics of superfluid $^3$He in aerogel

PACS: 67.57.Lm, 76.60.-k

Received: 01.08.2002