论文标题
FCC抗铁磁铁中的磁杆相互作用的基态选择
Ground state selection by magnon interactions in the fcc antiferromagnet
论文作者
论文摘要
我们研究了带有任意旋转的面部中心的立方晶格上最近的邻居海森贝格抗铁磁铁。该模型表现出退化的经典基础状态，包括两个共线结构AF1和AF3，由不同的传播向量描述，这些构图是量子基态的主要候选者。我们使用自旋波理论来计算两个状态中每个状态的能量，该旋转理论包括以自洽的方式和数值耦合群集方法，该理论包括镁麦克努尼相互作用。我们的结果明确地表明，量子波动稳定了自旋的现实值的AF1状态。预测AF3状态的谐波自旋结果的过渡仅发生在s> 10中。我们还研究了两种状态的镁光谱的量子重新归一化，这是自旋的函数。
We study the nearest-neighbor Heisenberg antiferromagnet on a face-centered cubic lattice with arbitrary spin S. The model exhibits degenerate classical ground states including two collinear structures AF1 and AF3 described by different propagation vectors that are prime candidates for the quantum ground state. We compute the energy for each of the two states as a function of S using the spin-wave theory that includes magnon-magnon interaction in a self-consistent way and the numerical coupled cluster method. Our results unambiguously demonstrate that quantum fluctuations stabilize the AF1 state for realistic values of spin. Transition to the harmonic spin-wave result, which predicts the AF3 state, takes place only for S > 10. We also study quantum renormalization of the magnon spectra for both states as a function of spin.
