Spin correlations in the low-density electron system
Geldart, D. J. W.
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The authors have calculated the spin susceptibility x(q,) within a microscopic model over the full range of densities of the electron liquid in the paramagnetic state. Electron-electron interactions are described by static random-phase-approximation screening modified by a local-field correction which takes into account the exchange-correlation hole in the low-density regime. They focus attention on the dynamic properties of the system, calculating the spin-spin susceptibility x(q,). Their results can be represented in terms of a complex Stoner-like enhancement function I(q,) with an explicit dependence on the wave number q and frequency . The authors find except for very large q and that I(q,) has only a weak functional dependence on q and and is nearly real, justifying the original Stoner approximation for a wide range of q and . They find when I(q,) does develop a q dependence, that this corresponds to a buildup of short-range spin correlations in the system that goes beyond the scope of the original Stoner model. The authors results provide a first-principles determination of the density dependence of the Stoner enhancement factor. Finally, they find that paramagnons persist well away from the ferromagnetic transition
Green, F., D. Neilson, L. Swierkowski, J. Szymanski, et al. 1993. "Spin correlations in the low-density electron system." Physical Review B (Condensed Matter) 47(8): 4187-92. Copyright © 1993 American Physical Society.