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Effect of Strong Magnetic Fields on Superfluid 3He in 98% Porosity Aerogel

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We report our results of shear acoustic impedance measurements performed on superfluid 3He in 98% porosity silica aerogel. Experiments in high porosity aerogel provide unique opportunity to study the influence of disorder on a p-wave superfluid and compare the behavior with that of the well understood pure bulk. Our experiment is designed to detect acoustic signatures from both bulk liquid and liquid in aerogel. In the past, experiments on 3He in aerogel have been conducted in zero or low magnetic fields (< 1 tesla). We made measurements in magnetic fields as high as 15 tesla at 28.4 and 33.5 bars and observed a new phase in aerogel induced by magnetic fields splitting the superfluid transition into two.

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Correspondence to Y. Lee.

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PACS numbers: 67.57Pq, 67.80Mg

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Choi, H., Gray, A., Vicente, C. et al. Effect of Strong Magnetic Fields on Superfluid 3He in 98% Porosity Aerogel. J Low Temp Phys 138, 107–115 (2005). https://doi.org/10.1007/s10909-005-1535-5

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Keywords

  • Magnetic Field
  • Impedance Measurement
  • High Porosity
  • Acoustic Signature
  • Acoustic Impedance