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- W2257806824 abstract "An investigation has been made of second sound in mixtures of ${mathrm{He}}^{3}$-${mathrm{He}}^{4}$ in the temperature region obtained by demagnetization of a paramagnetic salt. Several concentrations of ${mathrm{He}}^{3}$ were used ranging between 0.0017 percent and 4.3 percent. The velocity of second sound for the mixtures was found to reach a maximum value of about 35 meters/sec just below 1ifmmode^circelsetextdegreefi{}K and to approach 20 meters/sec near 0.2ifmmode^circelsetextdegreefi{}K. In addition, essentially no dispersion of second-sound pulses in mixture below 1ifmmode^circelsetextdegreefi{}K was observed. This is in marked contrast to heat pulses in pure ${mathrm{He}}^{4}$ in this temperature region. Our results show general agreement with the theoretical predictions of Pomeranchuk, provided the effective mass $ensuremath{mu}$ of the ${mathrm{He}}^{3}$ atom is allowed to vary from 2.0 ${mathrm{m}}_{3}$ at 0.2ifmmode^circelsetextdegreefi{}K to 3.6 ${mathrm{m}}_{3}$ at 1.8ifmmode^circelsetextdegreefi{}K." @default.
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- W2257806824 date "1954-01-01" @default.
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- W2257806824 title "Second Sound inHe3-He4Mixtures below 1°K" @default.
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- W2257806824 doi "https://doi.org/10.1103/physrev.93.21" @default.
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