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Abstract
The aim of the present paper is to study the magnon specific heat by using the quasi-two-dimensional Heisenberg model and Zubarev's double time temperature dependent Green's function. We used the equation of motion method and the Callen decoupling method to evaluate the double time temperature dependent Green's functions. In antiferromagnetic materials, it is found that there is some axis along which the magnetic moment tends to align with lower energy, due to the presence of anisotropic antiferromagnetic correlation coupling. We study the role of anisotropic antiferromagnetic coupling on the magnon specific heat. Using our theory, we have calculated the contribution of the magnon specific heat in YBa 2 Cu 3 O 6 and La 2 CuO 4 high-temperature superconducting compounds in the antiferromagnetic phase. The role of interlaycr coupling between CuO laycrs has also been studied.
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