Abstract
Spin-wave theory is used to study the effects of interlayer coupling on the properties of layered Heisenberg ferromagnets with S=1/2. The asymptotic expressions of magnetization and specific heat with temperature and interlayer coupling strength (${\mathit{J}}_{\mathrm{\ensuremath{\perp}}}$) are given in two low-temperature regimes distinguished by a characteristic temperature ${\mathit{T}}_{0}$=2${\mathit{J}}_{\mathrm{\ensuremath{\perp}}}$/${\mathit{k}}_{\mathit{B}}$. It is shown that the interlayer coupling, though very small, is essential if long-range order at nonzero temperature is to exist.
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