Superfluid density ofin 98% aerogel in small magnetic fields
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We performed low-frequency sound measurements on He3 in 98% aerogel in a magnetic field that was varied between 0 and 2130 G at a fixed pressure of 27.9 bar. We monitor the frequency of the second sound like (slow) mode, which is the manifestation of superfluidity of He3 in the presence of correlated disorder, and use its temperature dependence to calculate the superfluid fraction s/. We observed no field dependence of the s (T)/, other than an increase in the temperature range where the A -like (A*) phase is metastable. Both the A* and B phases have a smaller s (T)/ than that of bulk He3, and the ratio s A*/sB is 0.5 over the whole temperature range. The A* phase does not reappear on warming from the B phase until a field in excess of 1270 Gauss is applied. 2005 The American Physical Society.
author list (cited authors)
Nazaretski, E., Lee, D. M., & Parpia, J. M.
complete list of authors
Nazaretski, E||Lee, DM||Parpia, JM