| 1. | A method beyond mean - field theory is applied to investigate the effects of the long - range interaction on the physical properties of the ferroelectric thin film
在这篇论文里，我们在横场伊辛模型和朗道唯象理论的框架内引入长程相互作用。 |
| 2. | Ii ) with the increase of the long - range interaction and the interfacial coupling , the pyroelectric coefficient before the phase transition temperature decreases
另外，随着长程相互作用以及界面耦合强度的增强，相变温度以下的热电系数明显减小。 |
| 3. | The curie temperature of ferroelectric films is studied using spin - 1 / 2 transverse ising model with long - range interactions within the framework of an effective - field theory
我们首先应用有效场理论，在横场伊辛模型的框架内研究了赝自旋s = 1 / 2的具有长程相互作用的铁电薄膜的相变性质。 |
| 4. | We find that i ) with the increase of the long - range interaction , the interfacial coupling and the thickness of one period , the phase transition temperature of the ferroelectric superlartice increases
我们发现，随着长程相互作用和界面耦合作用的增强以及铁电超晶格尺寸的增大，整个材料的相变温度升高。 |
| 5. | The effects of the interfacial coupling and the thickness of one period on the pyroelectric properties of the superlartice are investigated by taking into account the long - range interaction
研究了长程相互作用对铁电超晶格热电性质的影响，并在考虑了长程相互作用的情况下，分别研究了界面耦合和尺寸效应对铁电超晶格热电性质的影响。 |
| 6. | It is found that the pyroelectric coefficient and susceptibility increase with the decrease of the magnitude of the long - range interaction and the interfacial coupling when the temperature is lower than the phase transition temperature
我们发现，在相变温度以下，随着双层薄膜的界面耦合的减弱，铁电双层薄膜的热电系数和介电极化率增加。 |
| 7. | It is found that the enhancement of the long - range interaction will result in the increment of the phase transition temperature , the increase of the critical transverse field and the decrease of the critical size
采用超越平均场理论计算了长程相互作用对铁电薄膜的物理性质的影响，发现长程相互作用的增强将使铁电薄膜的居里温度升高、临界横场增大、临界尺寸下降。 |
| 8. | The calculated values are consistent with experimental results . 3 . the potentials of the long - range interactions are much different for the system in the atom - diatom [ v r ( t ) - 6 ] , and that in diatom - diatom [ v r ( t ) - 3 ] , so the interference effects are different theoretically
3 .原子一分子体系与极性分子一极性分子的长程作用势有明显的不同，对于原子一分子体系，长程相互作用势vocr ( o场，而极性分子一分子体系的长程相互作用势v二r ( o一， 。 |
| 9. | In the framework of the transverse ising model ( tim ) , landau phase transition theory and the electrostatic field theory , we study the physical properties of the ferroelectric thin film , bilayer , sandwich structure , multilayer with a non - polarization slab and a two - dimension polar lattice model with polar defects . the main work and results are as follows : first , the long - range interaction in ferroelectric material is sometimes neglected in the previous studies . we introduce the long - range interaction in the framework of the tim and the landau theory
本文在横场伊辛模型、朗道相变理论以及静电场等理论的框架内，对铁电薄膜、铁电双层膜、铁电三明治结构以及含有杂质层的铁电多层膜和含有偶极缺陷的二维偶极点阵系统等多层铁电系统的相变、热电、介电、电滞行为等物理性质进行了深入研究。 |
| 10. | We also find that the strong long - range interaction , the large transverse field and weak interfacial coupling can lead to the disappearance of some of the peaks of the pyroelectric coefficient and susceptibility of the ferroelectric bilayer . we believe that it is the reason why these phenomena always take place in the experimental studies
我们还发现，较强的长程相互作用，较大的横场以及相对较弱的界面耦合作用将会导致铁电双层薄膜的热电系数和介电极化率的某些峰消失，这可以用来解释在实验中常常观测不到热释电系数和介电极化率的某些峰值的原因。 |
