Double exchange model on triangular lattice: non-coplanar spin configuration and phase transition near quarter filling
- Resource Type
- Working Paper
- Authors
- Zhang, G. P.; Zhang, Jian; Zhang, Qi-Li; Zhou, Jiang-Tao; Shangguan, M. H.
- Source
- Physica B 417, 4-8 (2013)
- Subject
- Condensed Matter - Strongly Correlated Electrons
Physics - Computational Physics
- Language
Unconventional anomalous Hall effect in frustrated pyrochlore oxides is originated from spin chirality of non-coplanar localized spins, which can also be induced by the competition between ferromagnetic (FM) double exchange interaction $J_{H}$ and antiferromagnetic superexchange interaction $J_{AF}$. Here truncated polynomial expansion method and Monte Carlo simulation are adopted to investigate the above model on two-dimensional triangular lattice. We discuss the influence of the range of FM-type spin-spin correlation and strong electron-spin correlation on the truncation error of spin-spin correlation near quarter filling. Two peaks of the probability distribution of spin-spin correlation in non-coplanar spin configuration clearly show that non-coplanar spin configuration is an intermediate phase between FM and 120-degree spin phase. Near quarter filling, there is a phase transition from FM into non-coplanar and further into 120-degree spin phase when $J_{AF}$ continually increases. Finally the effect of temperature on magnetic structure is discussed.
Comment: 10 pages, 5 figures