Exact Statistical Thermodynamics of the Pseudospin-1 System on the Diced Lattice

Statistical thermodynamics of the diced lattice

In this work we analyze the statistical thermodynamics of Diced lattice carriers employing a Greens function formulation to examine the grand potential, Helmholtz free energy, the grand and ordinary partition functions and entropy. This facilitates the calculation of the specific heat, and all evaluations are carried out for both the degenerate and nondegenerate statistical regimes.

不规则晶格上Potts模型的偏序和有限温度相变

Partial order and finite-temperature phase transitions in Potts models on irregular lattices

我们用张量数值方法研究了四态反铁磁Potts模型在Union-Jack晶格上的热力学性质。我们提出了强有力的证据，以前未知的，“熵驱动”，有限温度相变到一个部分有序的状态。从Potts模型在分块晶格和中心分块晶格上的热力学出发，我们提出有限温度跃迁和部分有序态在不规则晶格上是普遍存在的。

Unconventional spin frustration due to two competing ferromagnetic interactions of a spin-1/2 Ising-Heisenberg model on martini and martini-diced lattice

The spin-1/2 Ising-Heisenberg model on martini and martini-diced lattice is exactly solved using a star-triangle transformation, which affords an exact mapping correspondence to an effective spin-1/2 Ising model on a triangular lattice. The ground-state phase diagram of both investigated quantum spin models display two spontaneously ordered ferromagnetic phases and one macroscopically degenerate disordered phase. In contrast to a classical ferromagnetic phase where the spontaneous magnetization of the Ising as well as Heisenberg spins acquire fully saturated values the spontaneous magnetizatio…

赝自旋电子模型的热力学

Thermodynamics of a Pseudospin-Electron Model

本文的目的是给出赝自旋-电子模型在赝自旋间不同类型相互作用情况下的热力学性质。首先，我们提供了一个概述的工作，其中处理的赝自旋-电子模型的理论研究，包括直接赝自旋-赝自旋相互作用（但没有电子转移）的结果。其次，我们给出了在没有赝自旋-赝自旋直接相互作用和Hubbard关联的情况下，当赝自旋之间通过导电电子相互作用时模型的研究结果。

高斯涨落近似下赝自旋电子模型的热力学性质研究

Investigation of thermodynamic properties of pseudospin-electron model in the gaussian fluctuation approximation

本文在GRPA格式的框架内考虑了有效平均场的高斯涨落，并应用于赝自旋电子模型（PEM）的计算。计算了巨正则势、赝自旋平均值和涨落均方。得到的结果与相应的其他近似得到的。讨论了平均场的高斯涨落对质子交换膜热力学性质的影响。

无关联赝自旋电子模型的热力学

Thermodynamics of a pseudospin-electron model without correlations

研究了无关联赝自旋电子模型的热力学性质。计算了关联函数、赝自旋和粒子数的平均值以及热力学势。计算是在平均场近似下用图解法进行的。单粒子格林函数采用Hubbard-I近似。数值研究表明，在$μ={}$常数区，电子与赝自旋子系统之间的相互作用导致了温度变化时赝自旋平均值$<S^z>$的跃变和电子能谱的重构，从而导致了一级相变的可能性.在$n={}$ const状态下，对于模型参数的某些值，电子子系统中的相分离可能发生不稳定性。