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The Debye-Waller Factor in solid 3He and 4He

E. W. Draeger·D. M. Ceperley
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Abstract

The Debye-Waller factor and the mean-squared displacement from lattice sites for solid 3He and 4He were calculated with Path Integral Monte Carlo at temperatures between 5 K and 35 K, and densities between 38 nm^(-3) and 67 nm^(-3). It was found that the mean-squared displacement exhibits finite-size scaling consistent with a crossover between the quantum and classical limits of N^(-2/3) and N^(-1/3), respectively. The temperature dependence appears to be T^3, different than expected from harmonic theory. An anisotropic k^4 term was also observed in the Debye-Waller factor, indicating the presence of non-Gaussian corrections to the density distribution around lattice sites. Our results, extrapolated to the thermodynamic limit, agree well with recent values from scattering experiments.

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E. W. Draeger, D. M. Ceperley. 1999-10-20. The Debye-Waller Factor in solid 3He and 4He. https://doi.org/10.1103/physrevb.61.12094

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