ランダム三角格子反強磁性体の励起スペクトル

概要

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A numerical investigation has been carried out for spectral distributions of the magnetic excitation of a substitutionally disordered antiferromagnetic system on the triangular lattice;it has been studied how the profile of the spectra change with the increase of the concentration of the nonmagnetic atom added to the system and especially how they behave near the percolation threshold.Here,the classical continuous Heisenberg model was adopted to seek the orientations of the spins in their lowest energy state by the Monte Carlo method.The motion of the deviations of the spins from the configuration in that state was described by the linear spin wave approximation.三角格子上の反強磁性体に非磁気的原子を混入したとき，磁気的励起スペクトルが混入率にどのように変化するかを調べた。その結果，CPA法が適用出来なかった臨界パーコレーション濃度の前後でスペクトルの形状が大きく変わることを示した。
大阪教育大学の論文