Schmalfuss D, Darradi R, Richter J, Schulenburg J, Ihle D
Institut für Theoretische Physik, Universität Magdeburg, 39016 Magdeburg, Germany.
Phys Rev Lett. 2006 Oct 13;97(15):157201. doi: 10.1103/PhysRevLett.97.157201. Epub 2006 Oct 10.
Using the coupled-cluster method and the rotation-invariant Green's function method, we study the influence of the interlayer coupling Jperpendicular on the magnetic ordering in the ground state of the spin-1/2 J1-J2 frustrated Heisenberg antiferromagnet (J1-J2 model) on the stacked square lattice. In agreement with known results for the J1-J2 model on the strictly two-dimensional square lattice (Jperpendicular=0), we find that the phases with magnetic long-range order at small J2
利用耦合簇方法和旋转不变格林函数方法，我们研究了层间耦合(J_{\perp})对堆叠正方形晶格上自旋为(1/2)的(J_1-J_2)受挫海森堡反铁磁体（(J_1-J_2)模型）基态磁有序的影响。与严格二维正方形晶格（(J_{\perp}=0)）上(J_1-J_2)模型的已知结果一致，我们发现，在小(J_2\lt J_{c1})和大(J_2\gt J_{c2})时具有磁长程序的相被磁无序（量子顺磁）基态相分隔。增加层间耦合(J_{\perp}\gt0)，该相的参数区域减小，最终，对于相当小的(J_{\perp}\approx(0.2 - 0.3)J_1)，量子顺磁相消失。
