Double Exchange Model in Triangular Lattice Studied by Truncated Polynomial Expansion Method

作者：Zhang, Gui Ping^*

来源：Communications in Computational Physics, 2011, 10(2): 422-432.

DOI：10.4208/cicp.160410.240910a

• Manganite
• Monte Carlo simulation
• polynomial moment expansion
• triangular lattice
• frustration
• finite-size effect

The low temperature properties of double exchange model in triangular lattice are investigated via truncated polynomial expansion method (TPEM), which reduces the computational complexity and enables parallel computation. We found that for the half-filling case a stable 120 degrees spin configuration phase occurs owing to the frustration of triangular lattice and is further stabilized by antiferromagnetic (AF) superexchange interaction, while a transition between a stable ferromagnetic (FM) phase and a unique flux phase with small finite-size effect is induced by AF superexchange interaction for the quarter-filling case.

• 出版日期2011-8
• 单位中国人民大学