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arXiv 2212.06752cond-mat.stat-mechcond-mat.mtrl-sci
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准一维Ising稀体系链段的热力学特征

Thermodynamic signatures of chain segmentation in dilute quasi-one dimensional Ising systems

Johnathan M. Bulled, Mario Falsaperna, Paul J. Saines, Andrew L. Goodwin

摘要:

热容测量是了解含有一维基序的系统的复杂相行为的有用工具。在这里,我们研究在这样的测量缺陷纳入准一维(q-1D)系统的签名。使用蒙特卡罗模拟,我们表明,在稀释的非相互作用的网站,q-1D伊辛模型显示低温签名不存在于传统的三维模型。一维链的受挫嵌入表现出与未受挫嵌入相似的特征,前者还出现了有限基态熵,这是由链分割引起的。我们引入了一个平均场公式,它捕获了模型的低温行为。这一理论框架适用于解释实验热容测量的Tb $_{1-ρ}$ Y $_ρ$(HCOO)$_3$家庭的磁热。我们发现模拟和实验之间有很好的对应关系,建立这个系统作为一个典型的例子,稀q-1D磁体。

英文摘要:

Heat-capacity measurements are a useful tool for understanding the complex phase behaviour of systems containing one-dimensional motifs. Here we study the signature within such measurements of the incorporation of defects into quasi-one-dimensional (q-1D) systems. Using Monte Carlo simulations, we show that, on dilution by non-interacting sites, q-1D Ising models display a low-temperature signature not present in conventional three-dimensional models. Frustrated embeddings of 1D chains show similar features to unfrustrated embeddings, with the additional emergence of a finite ground-state entropy in the former, which arises from chain segmentation. We introduce a mean-field formulation which captures the low-temperature behaviour of the model. This theoretical framework is applied to the interpretation of experimental heat-capacity measurements of the Tb$_{1-ρ}$Y$_ρ$(HCOO)$_3$ family of magnetocalorics. We find good correspondence between simulation and experiment, establishing this system as a canonical example of dilute q-1D magnets.

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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