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arXiv · 1002.0269

Ultrasound attenuation and a P-B-T phase diagram of superfluid 3He in 98% aerogel

B. H. Moon·N. Masuhara·P. Bhupathi·M. Gonzalez·M. W. Meisel·N. Mulders·Y. Lee
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Abstract

Longitudinal sound attenuation measurements in superfluid 3He in 98% aerogel were conducted at pressures between 14 and 33 bar and in magnetic fields up to 4.44 kG. The temperature dependence of the ultrasound attenuation in the A-like phase was determined for the entire superfluid region exploiting the field induced meta-stable A-like phase at the highest field. In the lower field, the A-B transition in aerogel was identified by a smooth jump in attenuation on both cooling and warming. Based on the transitions observed on warming, a phase diagram as a function of pressure (P), temperature (T) and magnetic field (B) is constructed. We find that the A-B phase boundary in aerogel recedes in a drastically different manner than in bulk in response to an increasing magnetic field. The implications of the observed phase diagram are discussed.

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B. H. Moon, N. Masuhara, P. Bhupathi, M. Gonzalez, M. W. Meisel, N. Mulders, Y. Lee. 2010-02-01. Ultrasound attenuation and a P-B-T phase diagram of superfluid 3He in 98% aerogel. https://doi.org/10.1103/physrevb.81.134526

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