Magnetic dissipation in superfluid {sup 3}He-B in the transition regime to nonhydrodynamic conditions

Journal Article · Mon Sep 01 04:00:00 EDT 1997 · Journal of Low Temperature Physics

DOI:https://doi.org/10.1007/BF02397685· OSTI ID:569770

Feher, A; Harakaly, R; Lokner, L ^[1]

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1. P.J. Safarik Univ., Kosice (Sierra Leone); and others

The authors have applied the so-called HPD spectroscopy, i.e. the NMR of the homogeneously precessing domain (HPD) in superfluid {sup 3}He-B, to study the magnetic relaxation processes down to 0.3 T{sub c}. The power absorbed by HPD from cw NMR rf-field was divided into several contributions corresponding to different relaxation processes. From these contributions nonhydrodynamic corrections to spin diffusion and Leggett-Takagi (L-T) relaxation were extracted for a pressure of 6 bar. Below 0.45 T{sub c} a large absorption term linear with the HPD length and increasing with the falling temperature was observed. This term could be associated with an instability of coherent precession in the nonhydrodynamic regime. The process of the HPD formation in the nonwetting regime, for T < 0.37 T{sub c}, was observed and described, leading to a new possibility to determine the d-constant of the surface energy.

• Sponsoring Organization: USDOE
• OSTI ID: 569770
• Journal Information: Journal of Low Temperature Physics, Journal Name: Journal of Low Temperature Physics Journal Issue: 5-6 Vol. 108; ISSN JLTPAC; ISSN 0022-2291
• Country of Publication: United States
• Language: English

Related Subjects

66 PHYSICS
DISSIPATION FACTOR
HELIUM 3 B
NUCLEAR MAGNETIC RESONANCE
RELAXATION LOSSES
SPIN