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- W2019614711 abstract "We investigate the low-temperature behavior of ferromagnets with a spontaneously broken symmetry $mathrm{O}(3)ensuremath{rightarrow}mathrm{O}(2).$ The analysis is performed within the perspective of nonrelativistic effective Lagrangians, where the dynamics of the system is formulated in terms of Goldstone bosons. Unlike in a Lorentz-invariant framework (chiral perturbation theory), where loop graphs are suppressed by two powers of momentum, loops involving ferromagnetic spin waves are suppressed by three momentum powers. The leading coefficients of the low-temperature expansion for the partition function are calculated up to order ${p}^{10}.$ In agreement with Dyson's pioneering microscopic analysis of the cubic ferromagnet, we find that, in the spontaneous magnetization, the magnon-magnon interaction starts manifesting itself only at order ${T}^{4}.$ The striking difference with respect to the low-temperature properties of the O(3) antiferromagnet is discussed from a unified point of view, relying on the effective Lagrangian technique." @default.
- W2019614711 created "2016-06-24" @default.
- W2019614711 creator A5014267416 @default.
- W2019614711 date "2002-02-20" @default.
- W2019614711 modified "2023-10-16" @default.
- W2019614711 title "Spontaneous magnetization of the O(3) ferromagnet at low temperatures" @default.
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- W2019614711 doi "https://doi.org/10.1103/physrevb.65.094430" @default.
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