Theory of Magnetically Dilute Systems
Theory of Magnetically Dilute Systems
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磁稀释系统理论
DOI：
10.1143/jpsj.27.1111
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发表时间：
1969
影响因子：
1.7
通讯作者：
T. Obokata
中科院分区：
文献类型：
--
作者：
T. Oguchi;T. Obokata
通过基于 Ising 和 Heisenberg 模型的有效哈密顿量方法，将用非磁性原子随机稀释的磁性晶体的临界温度（居里或尼尔温度）的变化评估为磁性原子浓度 p 的函数。计算不同浓度下伊辛铁磁体高于居里温度的比热，以了解肖特基型最大值的存在。还利用Pade近似计算了稀释铁磁体的临界磁化率指数和居里温度，以验证居里温度随p的减小而降低归因于铁磁系统有效维数减小的观点。
The variation of the critical temperature (the Curie or Neel temperature) of a magnetic crystal randomly diluted with non-magnetic atoms is evaluated as a function of concentration p of magnetic atoms by the effective Hamiltonian method based on the Ising and the Heisenberg models. The specific heat of Ising ferromagnet above the Curie temperature is calculated for various concentrations in order to see the existence of Schottky-type maximum. The critical index of susceptibility and the Curie temperature for diluted ferromagnet is also calculated using Pade approximation to check the idea that the lowering of the Curie temperature with the decrease of p is attributed to the decrease of effective dimensionality of ferromagnetic system.