Majumdar Kingshuk, Mahanti Subhendra D
Department of Physics, Grand Valley State University, Allendale, MI 49401, United States of America.
Department of Physics and Astronomy, Michigan State University, East Lansing, MI 48824, United States of America.
J Phys Condens Matter. 2021 Jan 18;33(12). doi: 10.1088/1361-648X/abd8b6.
We propose a novel two-dimensional (2D) frustrated quantum spin-1/2 anisotropic Heisenberg model with alternating ferromagnetic and antiferromagnetic magnetic chains along one direction and antiferromagnetic interactions along the other. The (mean-field) ground state is ferrimagnetic in certain range of the interaction space. Spin-wave theory analysis of the reduction of ordered moments at inequivalent spin sites and the instability of the spin waves suggest a quantum phase transition which has the characteristics of both the frustrated 2D antiferromagnetic= 1/2 (,) model and 1D= 1,= 1/2 quantum ferrimagnetic model.
我们提出了一种新颖的二维（2D）受挫量子自旋-1/2各向异性海森堡模型，该模型在一个方向上具有交替的铁磁和反铁磁磁链，而在另一个方向上具有反铁磁相互作用。在相互作用空间的特定范围内，（平均场）基态是亚铁磁性的。对不等价自旋位点处有序矩的降低以及自旋波的不稳定性进行的自旋波理论分析表明，存在一种量子相变，它具有受挫二维反铁磁自旋-1/2（XXZ）模型和一维自旋-1、自旋-1/2量子亚铁磁模型的特征。
