| 用临界点附近的涨落讨论Landau相变理论适用范围 |
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| 引用本文： | 王双进,李凌云,冯磊,何文辰.用临界点附近的涨落讨论Landau相变理论适用范围[J].河北工业大学学报,2008,37(1):73-76. |
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| 作者姓名： | 王双进 李凌云 冯磊 何文辰 |
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| 作者单位： | 河北工业大学理学院,天津,300130;河北工业大学理学院,天津,300130;河北工业大学理学院,天津,300130;河北工业大学理学院,天津,300130 |
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| 基金项目： | 国家自然科学基金
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河北省科学技术研究与发展计划 |
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| 摘 要： | Landau相变理论是研究晶体各种结构相变的有力工具.在临界点附近某些序参量的涨落很大,导致Landau相变理论失去作用.在自由能密度的展开式中需要考虑Ginzburg梯度项,通过对相对几率和关联函数的傅里叶分量来分析临界点附近的序参量的涨落,并由此得出Landau相变理论的适用范围.
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| 关 键 词： | Landau相变理论 Ginzburg梯度项 序参量涨落 关联函数 |
| 文章编号： | 1007-2373（2008）01-0073-04 |
| 收稿时间： | 2007-07-15 |
| 修稿时间： | 2007年7月15日 |
The Discussion for Applicable Scope of Landau Theory of Phase Transition in Flunction of the Critical Point Nearby |
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| WANG Shuang-jin,LI Ling-yun,FENG Lei,HE Wen-chen.The Discussion for Applicable Scope of Landau Theory of Phase Transition in Flunction of the Critical Point Nearby[J].Journal of Hebei University of Technology,2008,37(1):73-76. |
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| Authors: | WANG Shuang-jin LI Ling-yun FENG Lei HE Wen-chen |
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| Affiliation: | WANG Shuang-jin,LI Ling-yun,FENG Lei,HE Wen-chen ( School of Sciences,Hebei University of Technology,Tianjin 300130,China ) |
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| Abstract: | The Landau theory of phase transition is a powerful tool which studies all kinds of structural phase transition of crystal. In the critical point nearby, some order parameters fluctuate heavily and it causes that the Landau theory of phase transition has not work. It needs to consider the Ginzburg gradient item in flee energy density expansion. By dint of the relative probability and the Fourier component of connection function, we analyse the fluctuation of the order parameters in the critical point nearby, and thus we obtain the applicable scope of the Landau theory of phase transition. |
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| Keywords: | the Landau theory of phase transition the Ginzburg gradient item the fluctuation of the order parameter correlation funtion |
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