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- W1994474983 endingPage "8748" @default.
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- W1994474983 abstract "The neutron-scattering function for dilute mixtures of $^{3}mathrm{He}$ (1% and 5%) in superfluid $^{4}mathrm{He}$ at pressures of 0, 10, and 18 bars and temperatures in the range from 0.07 to 1.5 K has been determined for wave vectors between 0.4 and 2.2 A${mathrm{r{}}}^{mathrm{ensuremath{-}}1}$. This is the first such measurement for $^{3}mathrm{ensuremath{-}}^{4}$He mixtures at temperatures below the Fermi temperature. The line shape of the $^{3}mathrm{He}$ particle-hole excitation is well described by a nearly-free-Fermi-gas model at all temperatures. The $^{3}mathrm{He}$ quasiparticle spectrum is derived for wave vectors in the range 0.9Q1.7 A${mathrm{r{}}}^{mathrm{ensuremath{-}}1}$. The results deviate from the quadratic Landau-Pomeranchuk spectrum and are in good agreement with thermodynamical measurements. No rotonlike minimum is observed. We find strong indications of a crossover between the $^{3}mathrm{He}$ particle-hole band and the $^{4}mathrm{He}$ roton excitation. The pressure and temperature dependence of the shift and broadening of the $^{4}mathrm{He}$ phonon-roton peak is derived. The main features are reproduced in a simple model for Landau damping." @default.
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- W1994474983 date "1990-05-01" @default.
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- W1994474983 title "Elementary excitations in superfluid<mml:math xmlns:mml=http://www.w3.org/1998/Math/MathML display=inline><mml:mrow><mml:mmultiscripts><mml:mrow><mml:mi mathvariant=normal>−</mml:mi></mml:mrow><mml:mrow /><mml:mrow><mml:mn>4</mml:mn></mml:mrow><mml:mrow /><mml:mrow /><mml:mprescripts /><mml:mrow /><mml:mrow><mml:mn>3</mml:mn></mml:mrow><mml:mrow /><mml:mrow /></mml:mmultiscripts></mml:mrow></mml:math>He mixtures: Pressure and temperature dependence" @default.
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- W1994474983 doi "https://doi.org/10.1103/physrevb.41.8732" @default.
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