Experiments based on an analogy to the ac Josephson effect have shown in both 3He-A and 3He-B that a pairing theory of the superfluidity of 3He is essentially correct. Additional observations of parallel ringing are not in agreement with the simple "pendulum models" used to describe nonlinear dynamic magnetic effects.
Published in Physical Review Letters, ed. Gene D. Sprouse, Volume 35, Issue 15, 1975, pages 1010-1013.
Webb, R. A., Sager, R. E., & Wheatley, J. C. (1975). Nonlinear parallel ringing of magnetization in superfluid 3He. Physical Review Letters, 35(15), 1010-1013. DOI: 10.1103/PhysRevLett.35.1010
© Physical Review Letters, 1975, American Physical Society