Longitudinal magnetic relaxation in both 3He-A and 3He-B is studied in a variety of magnetic fields and three different geometries. Relaxation as described by Leggett and Takagi is observed for particular geometries in both 3He-A and 3He-B within a very limited range of magnetic field and temperature near T c. Under certain other conditions the longitudinal magnetization in 3He-A does not relax monotonically in time. Relaxation in 3He-B very near the critical temperature is shown to be remarkably different following nominal 90‡ and 180‡ pulses. Other observations using RF pulses with a time-dependent frequency provide evidence for a negative frequency shift in 3He-B at large tipping angles in certain geometries.
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Supported by the U.S. Department of Energy under contract number EY-76-S-03-0034, P.A. 143.
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Sager, R.E., Kleinberg, R.L., Warkentin, P.A. et al. Longitudinal magnetic relaxation in superfluid 3He. J Low Temp Phys 32, 263–300 (1978). https://doi.org/10.1007/BF00116916
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DOI: https://doi.org/10.1007/BF00116916