Ferromagnetic frustrated spin systems on the square lattice: Schwinger boson study

Article

关键词: QUANTUM HEISENBERG-ANTIFERROMAGNET;    FLUCTUATIONS;    PHASE;    ORDER;   

DOI  :  10.1103/PhysRevB.84.214406

来源: SCIE

【 摘 要 】

We study a ferromagnetic Heisenberg spin system on the square lattice, with nearest-neighbor interaction J(1) frustrated by second, J(2), and third, J(3), neighbor antiferromagnetic interactions, using a mean-field theory for the Schwinger boson representation of spins. For J(3) = 0 we find that the boundary between the ferromagnetic and the collinear classical phases shifts to smaller values of J(2) when quantum fluctuations are included. Along the line J(2)/|J(1)| = 1 the boundaries between the collinear and incommensurate regions are strongly shifted to larger values with respect to the classical case. We do not find clear evidence for spin-gapped phases within the present approximation.

【 授权许可】

Free