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

Double Exchange Model in Triangular Lattice Studied by Truncated Polynomial Expansion Method
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截断多项式展开法研究三角格子中的双交换模型

DOI:
10.4208/cicp.160410.240910a
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发表时间:
2011
期刊:
影响因子:
--
通讯作者:
G. P. Zhang
G. P. Zhang
中科院分区:
--
文献类型:
--
作者:
G. P. Zhang

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采用截断多项式展开法(TPEM)研究了三角晶格中双交换模型的低温性质,降低了计算复杂度,实现了并行计算。我们发现,对于半填充的情况,由于三角形晶格的受挫,出现了稳定的120度自旋组态相,并被反铁磁(AF)超交换作用进一步稳定,而对于四分之一填充的情况,AF超交换作用诱导了稳定的铁磁(FM)相到唯一的有限尺寸效应的磁通相之间的转变。
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-degree 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.
使用截断多项式展开法研究巨磁阻锰氧化物的一能带和两能带模型
DOI: --
发表时间: 2006
期刊: Phys. Rev. B (2006) 73
影响因子: --
作者:
C.Sen;G.Alvarez;Y.Motome;N.Furukawa;I.A.Sergienko;T.Schulthess;A.Moreo;E.Dagotto
通讯作者: E.Dagotto