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Ultrasound attenuation and a P-B-T phase diagram of superfluid 3He in 98% aerogel by Moon, B. H.; Masuhara, N.; Bhupathi, P.; Gonzalez, M.; Meisel, M. W.; Mulders, N.; Lee, Y. is a scholarly article available to read on EtoBox.

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

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.

Author

Moon, B. H.; Masuhara, N.; Bhupathi, P.; Gonzalez, M.; Meisel, M. W.; Mulders, N.; Lee, Y.

Published

2010

Language

EN