arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 0710.0529cond-mat.stat-mech
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fcc Blume Emery Griffiths模型交错四极区的Cu-Au型有序

Cu-Au type orderings in the staggered quadrupolar region of the fcc Blume Emery Griffiths model

A. Ozkan, B. Kutlu

摘要:

采用改进的Creutz元胞自动机(CCA)算法,对面心立方(fcc)晶格的自旋1伊辛(BEG)模型进行了模拟。fcc BEG模型的基态图($k$,$d$)具有铁磁有序区($F$)、四极有序区($Q$)和交错四极有序区($SQ$)。在交错四极区中对$ -24\leq d=D/J<0$和$-3\leq k=K/J\leq 0$区间中的参数值进行了模拟。分别通过$ k=-3$和$d=-4$谱线得到了($ kT_{C}/J$,$d$)和($kT_{C}/J$,$k$)平面上的相图。交错的四极有序区分为五个有序区($A_{3}B(a)$,$A_{3}B(f)$,$AB$(type-I),$AB$(type-II)和$AB_{3}(f)$),它们具有不同化学计量比的Cu-Au型结构。

英文摘要:

The spin-1 Ising (BEG) model has been simulated using a cellular automaton (CA) algorithm improved from the Creutz cellular automaton (CCA) for a face-centered cubic (fcc) lattice. The ground state diagram ($k$, $d$) of the fcc BEG model has ferromagnetic ($F$), quadrupolar ($Q$) and staggered quadrupolar ($SQ$) ordering regions. The simulations have been made in the staggered quadrupolar region for the parameter values in the intervals $ -24\leq d=D/J<0$ and $-3\leq k=K/J\leq 0$ . The phase diagrams on the ($ kT_{C}/J$, $d$) and the ($kT_{C}/J$, $k$) planes have been obtained through $ k=-3$ and $d=-4$ lines, respectively. The staggered quadrupolar ordering region separates into five ordering regions ($A_{3}B(a)$, $A_{3}B(f)$, $AB$ (type-I), $AB$(type-II) and $AB_{3}(f)$) which have the different stoichiometric Cu-Au type structures.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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