Abstract
The method of two-time Green's functions is used to calculate the temperature dependences of the antiferromagnetic-resonance (AFR) frequencies for a uniaxial antiferromagnet in the field range below sublattice-reversal fields. The AFR frequency has a [K(T)/M(T)]1/2 dependence on the anisotropy constant K(T). For the simplest case of single-ion anisotropy, the normalized AFR frequency is proportional to the relative sublattice magnetization: ω(T) /ω(0) ∼ σ(T).
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