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Various equilibrium thermal properties of strongly magnetized solid3He at melting are discussed in terms of the asymptotic, isotropic, nearest-neighbor pair-exchange interaction model at temperatures above 3 mK. Experimental verification of the predictions of the model to a limited degree of...
The phonon theory is formulated in terms of transfer functions, which are solutions of the transfer integral equation. Since these functions already implicitly contain the effects of anharmonicities and of the hard core, no further difficulties occur from these properties of the potential. The...
Measurements of both A→B and B→A transitions have been made as a function of magnetic field up to ∼100 G at temperatures and pressures close to the polycritical point (PCP). Forms for the specific heat differenceC
and for the magnetization differenceM
The dynamical susceptibility of impurity electrons is studied for the symmetric single-orbital Anderson model. The present theory is based on a perturbation expansion in terms ofU, the interaction between impurityd electrons. The result shows how the impurity spin fluctuation peak is developed...
The density fluctuation excitation spectrum of He II is calculated using a generalized polarization potential approach and shown to yield a phonon-roton spectrum for wave vectors less than 2.1 Å−1 in excellent quantitative agreement with that observed in neutron scattering experiments for...
The phonon spectrum in a quantum crystal, where short-range correlations are important, is obtained by adapting the general relations between the one-phonon response and the thermodynamic properties of an anharmonic crystal proposed by Götze. Specifically, the one-phonon self-energy is obtained...
The spectrum of rotons in two-dimensional liquid helium II is estimated within the Bijl-Feynman theory. Due to stronger short-range order and more effective back flow, the roton gap Δ is found to be about half as big as the bulk roton energy.
From the second-sound velocityU
near the superfluid transition point, the superfluid densities in3He-4He mixtures, ρ
(X) and ρ
(φ), were deduced along the paths of constant3He concentrationX and of constant chemical potential difference φ of3He and4He. The following critical exponents of...
Measurements of the complex acoustic shear impedance of3He-B at 19 bar and 36 and 60 MHz, and of3He-A at 23 bar and 12, 36, and 60 MHz, have been made by observing the time constant and the frequency shift of the decay of a transiently excited AC-cut quartz transducer.
Phonon dispersion in liquid He II at long wavelengths and low temperatures is calculated using a generalized polarization potential approach and shown to yield results in good agreement with both superthermal phonon propagation and neutron scattering experiments at pressures up to 24 bar. It is...
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