Effects of disorder and magnetic field in frustrated magnets

Effects of disorder and magnetic field in frustrated magnets
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受挫磁体中无序和磁场的影响

DOI：
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发表时间：
2000
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通讯作者：
Universidade Federal de Pernambuco
Universidade Federal de Pernambuco
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文献类型：
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作者：
A. Souza;F. Moreira;J. R. L. D. A. D. D. Fisica;Universidade Federal de Pernambuco;Dept. de Fisica e Matematica;Universidade Federal de Pernambuco

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本文用蒙特卡罗模拟方法研究了面心立方晶格中的位置稀释反铁磁体伊辛模型。在低温下，我们发现随着外场的增加，从反铁磁相到超反铁磁相的转变是通过一个在未稀释体系中不存在的中间相发生的。这种新的相序对应于最近平均场计算中发现的一个相对应的亚晶格磁化有三个截然不同的值，从而表明在强受挫系统中可能会出现许多新的自旋有序，例如在一些焦绿石中发现的那样。
In this work a site diluted antiferromagntic Ising model in the FCC lattice is studied by Monte Carlo simulation. At low temperatures, we find that as the external field is increased the transition from the antiferromagnetic phase to the superantiferromagnetic one occurs through an intermediate phase which is not present in the undiluted system. This new phase ordering has three distinct values for the sublattice magnetizations corresponding to one of the phases found in a recent mean field calculation thus suggesting that in strongly frustrated systems many novel spins ordering may arises as found experimentally, for instance, in some pyrochlores.