arXivDaily arXiv每日学术速递 周一至周五更新
北美退伍军人节(Veterans Day),12 日无更新
arXiv 1001.0867cond-mat.stat-mechcond-mat.dis-nn
收藏

纯和无规键二维三角形Ising铁磁体的临界行为

Critical behavior of the pure and random-bond two-dimensional triangular Ising ferromagnet

Nikolaos G. Fytas, Anastasios Malakis

摘要:

研究了淬灭键随机性对嵌入三角晶格中的二维铁磁伊辛模型临界性质的影响。该系统的研究在纯和无序的版本由相同的有效的两阶段Wang-Landau方法。在第一部分的研究中,我们提出了纯模型的有限尺寸标度行为,我们计算了比热的对数膨胀的临界振幅。对于无序系统,数值数据和相关的详细有限尺寸标度分析沿着两个著名的方案-对数校正与弱普适性-强烈支持场理论预测的对数校正方案。一个特别的兴趣是支付给样品到样品的随机模型的波动和他们的缩放行为,被用作一个成功的替代方法的临界。

英文摘要:

We investigate the effects of quenched bond randomness on the critical properties of the two-dimensional ferromagnetic Ising model embedded in a triangular lattice. The system is studied in both the pure and disordered versions by the same efficient two-stage Wang-Landau method. In the first part of our study we present the finite-size scaling behavior of the pure model, for which we calculate the critical amplitude of the specific heat's logarithmic expansion. For the disordered system, the numerical data and the relevant detailed finite-size scaling analysis along the lines of the two well-known scenarios - logarithmic corrections versus weak universality - strongly support the field-theoretically predicted scenario of logarithmic corrections. A particular interest is paid to the sample-to-sample fluctuations of the random model and their scaling behavior that are used as a successful alternative approach to criticality.

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。

↑