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Magnetic Field Dependence of the A-like to B-like Transition of Superfluid 3He in Aerogel

Abstract

Longitudinal ultrasound attenuation of superfluid 3He in 98% aerogel has been measured at 33 bar and 6.22 MHz in the presence of magnetic fields up to 4.44 kG. The A-like to B-like (A-B like) phase transition in aerogel was identified by a rounded jump in attenuation while sweeping the temperature at a fixed magnetic field perpendicular to the direction of sound propagation. The suppression of the B-like phase was monitored as the magnetic field increased until the A-like phase region extended below our lowest attainable temperature (0.2 mK) at the highest field. In addition, the attenuation in the metastable A-like phase that appears when cooling in zero magnetic field was almost identical to the values observed in the A-like phase in high magnetic field.

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Correspondence to B. H. Moon.

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Moon, B.H., Masuhara, N., Bhupathi, P. et al. Magnetic Field Dependence of the A-like to B-like Transition of Superfluid 3He in Aerogel. J Low Temp Phys 158, 170 (2010). https://doi.org/10.1007/s10909-009-9954-3

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Keywords

  • Superfluid 3He
  • Aerogel

PACS

  • 67.30.Hb
  • 67.30.Hm
  • 67.30.Ht