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

Longitudinal ultrasound attenuation of superfluid 3 He 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...

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Bibliographic Details
Published in:Journal of low temperature physics 2010, Vol.158 (1-2), p.170-175
Main Authors: Moon, B. H., Masuhara, N., Bhupathi, P., Gonzalez, M., Meisel, M. W., Mulders, N., Lee, Y.
Format: Article
Language:English
Subjects:
Aerogels
Attenuation
Characterization and Evaluation of Materials
Condensed Matter Physics
Fluids
Low temperature physics
Magnetic fields
Magnetic Materials
Magnetism
Physics
Physics and Astronomy
Superfluidity
Sweeping
Ultrasound
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Summary:Longitudinal ultrasound attenuation of superfluid 3 He 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.
ISSN:0022-2291
1573-7357
DOI:10.1007/s10909-009-9954-3