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- W2022702891 abstract "The phase diagram of the superfluid phases of ${}^{3}mathrm{He}$ in 98% aerogel was determined in the range of pressure from 15 to 33 bars and for fields up to 3 kG using high-frequency sound. The superfluid transition in aerogel at 33.4 bars is field independent from 0 to 5 kG and shows no evidence of an ${A}_{1}ensuremath{-}{A}_{2}$ splitting. The first-order transition between the A and B phases is suppressed by a magnetic field, and exhibits strong supercooling at high pressures. We show that the equilibrium phase in zero applied field is the B phase with at most a region of A phase $ensuremath{lesssim}20 ensuremath{mu}mathrm{K}$ just below ${T}_{c}$ at a pressure of 33.4 bars. This is in contrast to pure ${}^{3}mathrm{He}$ which has a large stable region of A phase and a polycritical point. The quadratic coefficient for magnetic-field suppression of the $mathrm{AB}$ transition, ${g}_{a}(ensuremath{beta}),$ was obtained. The pressure dependence of ${g}_{a}(ensuremath{beta})$ is markedly different from that to the pure superfluid, ${g}_{0}(ensuremath{beta}),$ which diverges at a polycritical pressure of 21 bars. We compare our results with calculations from the homogeneous scattering model for ${g}_{a}(ensuremath{beta}),$ defined in a Ginzburg-Landau theory in terms of strong-coupling parameters ensuremath{beta}. We find qualitatively good agreement with the experiment if the strong-coupling corrections are rescaled from known values of the ensuremath{beta}'s for pure ${}^{3}mathrm{He},$ reduced by the suppression of the superfluid transition temperature. The calculations indicate that the polycritical pressure in the aerogel system is displaced well above the melting pressure and out of experimental reach. We cannot account for the puzzling supercooling of the aerogel $mathrm{AB}$ transition in zero applied field within the framework of known nucleation scenarios." @default.
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- W2022702891 date "2002-08-20" @default.
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- W2022702891 title "Phase diagram of the superfluid phases of<mml:math xmlns:mml=http://www.w3.org/1998/Math/MathML display=inline><mml:mrow><mml:msup><mml:mrow /><mml:mrow><mml:mn>3</mml:mn></mml:mrow></mml:msup></mml:mrow><mml:mi mathvariant=normal>He</mml:mi></mml:math>in 98% aerogel" @default.
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- W2022702891 doi "https://doi.org/10.1103/physrevb.66.054528" @default.
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