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arXiv 1709.08147cond-mat.stat-mech
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层次格上的Blume-Capel模型:精确局部性质

The Blume-Capel Model on Hierarchical Lattices: exact local properties

Mário J. G. Rocha-Neto, G. Camelo-Neto, E. Nogueira, S. Coutinho

摘要:

本文用数值递推的方法得到了二维和三维分级晶格上自旋为1的铁磁Blume-Capel模型的局域性质,并研究了它随温度和约化晶场参数的变化.在低温下,在呈现相重入现象的相图区域中,仔细研究了配置S=0状态中的磁化强度和位置密度。这两个序参量经历从铁磁到有序顺磁相的过渡,在低温下沿相边界减少突然的不连续性。在一个典型的配置文件中的磁化强度的分布上的过渡线,提出了一个广泛的多重分形谱,缩小对分形极限(单点)的序参量的不连续性增长向最大值。利用序参数不连续性的幅度和多重分形谱的窄化来确定三临界点可能的低温区间。

英文摘要:

The local properties of the spin one ferromagnetic Blume-Capel model defined on hierarchical lattices with dimension two and three are obtained by a numerical recursion procedure and studied as functions of the temperature and the reduced crystal-field parameter. The magnetization and the density of sites in the configuration S=0 state are carefully investigated at low temperature in the region of the phase diagram that presents the phenomenon of phase reentrance. Both order parameters undergo transitions from the ferromagnetic to the ordered paramagnetic phase with abrupt discontinuities that decrease along the phase boundary at low temperatures. The distribution of magnetization in a typical profile was determined on the transition line presenting a broad multifractal spectrum that narrows towards the fractal limit (single point) as the discontinuities of the order parameters grow towards a maximum. The amplitude of the order-parameter discontinuities and the narrowing of the multifractal spectra were used to delimit the low temperature interval for the possible locus of the tricritical point.

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